20256130503

Committed 16 Dec 2025 04:06AM UTC coverage: 88.241% (-4.7%) from 92.948%

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Merge pull request #41 from okcontract/vite7

Vite 7

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91.01

/src/array.ts

import type { AnyCell, MapCell, ValueCell } from "./cell";
import { collector, reuseOrCreate } from "./gc";
import type { SheetProxy } from "./proxy";

export type CellArray<T> = AnyCell<AnyCell<T>[]>;
export type ValueCellArray<T> = ValueCell<ValueCell<T>[]>;

/**
 * mapArray implements .map() for a cellified array.
 *
 * @param proxy
 * @param arr canonical form cell array
 * @param fn to map each element cell
 * @returns mapped array cell
 *
 * @description This function reuses existing mapped cells.
 * @todo Delete unused mapped cells
 */
export const mapArray = <T, U>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: (
    v: T,
    index?: number,
    cell?: AnyCell<T>
  ) => U | Promise<U | AnyCell<U>> | AnyCell<U>,
  name = "map"
): MapCell<MapCell<U, false>[], false> =>
  proxy.map(
    [arr],
    (cells, prev) => {
      if (!Array.isArray(cells))
        throw new Error(`not an array: ${typeof cells}`);
      if (!cells) return [];
      const set = new Set((prev || []).map((cell) => cell.id));
      const res = cells.map((cell, index) => {
        // reuse previously mapped cell
        const reuse = prev?.find((_c) => _c.dependencies?.[0] === cell.id);
        if (reuse !== undefined) set.delete(reuse.id);
        return (
          reuse ||
          // create new map
          proxy.map(
            [cell],
            (_cell) => fn(_cell, index, cell),
            `${cell.id}:[${index}]`
          )
        );
      });
      // collect unused previously mapped cells
      proxy._sheet.collect(...[...set]);
      return res;
    },
    name
  );

/**
 * Compares two values and returns a number indicating their order.
 *
 * This function is designed to be used as a comparator in sorting functions.
 * It returns:
 * - `1` if `a` is greater than `b`
 * - `-1` if `a` is less than `b`
 * - `0` if `a` is equal to `b`
 *
 * @param {*} a - The first value to compare.
 * @param {*} b - The second value to compare.
 * @returns {number} - Order.
 *
 * @example
 * const array = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5];
 * array.sort(defaultComparator);
 */
export const defaultComparator = <T>(a: T, b: T): number =>
  a > b ? 1 : a < b ? -1 : 0;

/**
 * implementation of sort for a cellified array.
 * @description this implementation relies on pointers but reuses the original cells.
 * @param proxy
 * @param arr
 * @param compare comparison function
 * @param noFail should be true when the following conditions are met:
 * 1. compare must be defined
 * 2. cells must be an array (possibly empty)
 * 3. compare should never fail
 */
export const sort = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  compare: (a: T, b: T) => number = defaultComparator,
  noFail?: NF
): MapCell<typeof arr extends AnyCell<infer U> ? U : never, NF> => {
  const coll =
    collector<MapCell<typeof arr extends AnyCell<infer U> ? U : never, NF>>(
      proxy
    );
  return proxy.mapNoPrevious(
    [arr],
    (cells) =>
      coll(
        proxy.mapNoPrevious(
          cells,
          (..._cells) =>
            _cells
              .map((_, index) => index)
              .sort((indexA, indexB) => compare(_cells[indexA], _cells[indexB]))
              .map((index) => cells[index]),
          "_sort",
          noFail || false
        )
      ),
    "sort",
    noFail || false
  );
};

/**
 * mapArrayCell is a variant of `mapArray` with a function taking
 * element cells as arguments.
 * @param proxy
 * @param arr
 * @param fn
 * @returns mapped array cell
 */
export const mapArrayCell = <T, U, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: AnyCell<(v: AnyCell<T>, idx?: number) => AnyCell<U>>,
  name = "map",
  nf?: NF
): MapCell<MapCell<U, NF>[], NF> => {
  let prevFn: (v: AnyCell<T>) => AnyCell<U>;
  return proxy.map(
    [arr, fn],
    (cells, _fn, prev) => {
      const arr = cells.map((cell, i) =>
        // @todo collect previously mapped cells
        reuseOrCreate(
          _fn === prevFn, // function unchanged
          () => prev?.find((_c) => _c.dependencies?.[0] === cell.id), // reuse
          () => _fn(cell, i) as MapCell<U, NF> // create new map
        )
      );
      prevFn = _fn;
      return arr;
    },
    name,
    nf
  );
};

/**
 * first element of recursive arrays.
 */
export const first = <T>(
  proxy: SheetProxy,
  arr: AnyCell<T | AnyCell<T>[]>,
  name = "last"
): MapCell<T, boolean> => {
  // @todo collectors (on path?)
  const aux = (arr: AnyCell<T | AnyCell<T>[]>) =>
    proxy.mapNoPrevious(
      [arr],
      (_arr) => {
        if (!Array.isArray(_arr)) return arr as AnyCell<T>;
        if (_arr.length === 0) return null; // @todo pointer to nullCell?
        return aux(_arr[0]);
      },
      name
    );
  return aux(arr);
};

/**
 * last element of recursive arrays.
 */
export const last = <T>(
  proxy: SheetProxy,
  arr: AnyCell<T | AnyCell<T>[]>,
  name = "last"
): MapCell<T, boolean> => {
  // @todo collectors (on path?)
  const aux = (arr: AnyCell<T | AnyCell<T>[]>) =>
    proxy.mapNoPrevious(
      [arr],
      (_arr) => {
        if (Array.isArray(_arr)) return aux(_arr[_arr.length - 1]);
        return arr as AnyCell<T>;
      },
      name
    );
  return aux(arr);
};

/**
 * reduce a cellified array.
 * @param proxy
 * @param arr
 * @param fn
 * @param init
 * @returns reduced cell
 */
export const reduce = <
  T,
  R extends unknown | Promise<unknown>,
  NF extends boolean = false
>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: (acc: R, elt: T, index?: number, cell?: AnyCell<T>) => R,
  init: R,
  name = "reduce",
  nf?: NF
): MapCell<R, NF> => {
  const coll = collector<MapCell<R, NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(
        proxy.mapNoPrevious(
          cells,
          (..._cells) =>
            _cells.reduce((acc, elt, i) => fn(acc, elt, i, cells[i]), init),
          "_reduce"
        )
      ),
    name,
    nf
  );
};

export const find = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  predicate: (v: T) => boolean,
  name = "find",
  nf?: NF
) => {
  const coll = collector<MapCell<T, NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.find(predicate))),
    name,
    nf
  );
};

export const findIndex = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  fn: (v: T) => boolean,
  name = "find",
  nf?: NF
) => {
  const coll = collector<MapCell<number, NF>>(proxy);
  return proxy.map(
    [arr],
    (cells) =>
      coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.findIndex(fn))),
    name,
    nf
  );
};

/**
 * filter updates a cellified array in a `ValueCell` using a predicate function as filter.
 * @param arr
 * @param predicate function that returns `true` for kept values.
 * @returns nothing
 * @description filtered out cells are _not_ deleted
 */
export const filter = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  predicate: AnyCell<(elt: T) => boolean>,
  arr: CellArray<T>,
  name = "filter",
  nf?: NF
) => {
  const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);
  return proxy.map(
    [predicate, arr],
    (fn, cells) =>
      coll(
        proxy.mapNoPrevious(
          cells,
          (..._cells) => cells.filter((_, i) => fn(_cells[i])),
          "_filter"
        )
      ),
    name,
    nf
  );
};

/**
 * `flattenCellArray` is a utility function that maps and flattens an array
 * of cells into a single cell that contains a flattened array of values.
 * It creates a new cell that reacts to changes in the input array and updates
 * its value accordingly.
 *
 * @template T - The type of the elements in the input cell array.
 * @template NF - Type indicating if the cells are failsafe.
 *
 * @param {SheetProxy} proxy - An instance of `SheetProxy` used to create new
 * cells and manage dependencies.
 * @param {CellArray<T>} arr - An array of cells, where each cell contains a
 * value of type `T`.
 * @param {string} [name="flatten"] - An optional name for the resulting cell.
 * Defaults to "flatten".
 * @param {NF} [nf] - An optional flag indicating whether the cells can't fail.
 * Defaults to `false`.
 *
 * @returns {MapCell<T[], NF>} - A cell containing a flattened array of values.
 */
export const flattenCellArray = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  arr: CellArray<T>,
  name = "flatten",
  nf?: NF
) => {
  const coll = collector<MapCell<T[], NF>>(proxy);
  return proxy.mapNoPrevious(
    [arr],
    (cells) =>
      cells === null
        ? null
        : coll(proxy.mapNoPrevious(cells, (..._cells) => _cells)),
    name,
    nf
  );
};

/**
 * filterPredicateCell updates a cellified array in a `ValueCell` using a predicate function as filter.
 * @param arr
 * @param predicate as Cell function that returns `true` for kept values.
 * @returns nothing
 * @description filtered out cells are _not_ deleted
 */
export const filterPredicateCell = <T, NF extends boolean = false>(
  proxy: SheetProxy,
  predicate: AnyCell<(elt: AnyCell<T>) => AnyCell<boolean>>,
  arr: CellArray<T>,
  name = "filter",
  nf?: NF
) => {
  const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);
  // Since predicate is a reactive function, we have to instantiate
  // the computation for each cell.
  // const keep = mapArrayCell(proxy, arr, predicate, "keep", nf);
  let prevFn: (elt: AnyCell<T>) => AnyCell<boolean>;
  const keep = proxy.map(
    [predicate, arr],
    (fn, cells, _prev: AnyCell<boolean>[]) => {
      // console.log({ keep: cells.length });
      // @todo if the predicate function has changed, collect previous mapped cells
      const keep = cells.map((cell) => {
        // We can reuse a cell only if the predicate hasn't changed.
        // @todo collect previously mapped cells for deleted cells in arr
        const reuse =
          prevFn === fn &&
          _prev?.find((_c) => _c.dependencies?.[0] === cell.id);
        return reuse || fn(cell);
      });
      prevFn = fn;
      return keep;
    },
    "keep",
    nf
  );
  return proxy.map(
    [arr, keep],
    (cells, _keep) =>
      coll(
        proxy.mapNoPrevious(
          _keep,
          (..._flat) => cells.filter((_, i) => _flat[i]),
          "filter.map"
        )
      ),
    name,
    nf
  );
};

1	import type { AnyCell, MapCell, ValueCell } from "./cell";
2	import { collector, reuseOrCreate } from "./gc";
3	import type { SheetProxy } from "./proxy";
4
5	export type CellArray<T> = AnyCell<AnyCell<T>[]>;
6	export type ValueCellArray<T> = ValueCell<ValueCell<T>[]>;
7
8	/**
9	* mapArray implements .map() for a cellified array.
10	*
11	* @param proxy
12	* @param arr canonical form cell array
13	* @param fn to map each element cell
14	* @returns mapped array cell
15	*
16	* @description This function reuses existing mapped cells.
17	* @todo Delete unused mapped cells
18	*/
19	export const mapArray = <T, U>(	1✔
20	proxy: SheetProxy,
21	arr: CellArray<T>,
22	fn: (
23	v: T,
24	index?: number,
25	cell?: AnyCell<T>
26	) => U \| Promise<U \| AnyCell<U>> \| AnyCell<U>,
27	name = "map"
28	): MapCell<MapCell<U, false>[], false> =>
29	proxy.map(	2✔
30	[arr],
31	(cells, prev) => {
32	if (!Array.isArray(cells))	6✔
33	throw new Error(`not an array: ${typeof cells}`);	×
34	if (!cells) return [];	6✔
35	const set = new Set((prev \|\| []).map((cell) => cell.id));	14✔
36	const res = cells.map((cell, index) => {	6✔
37	// reuse previously mapped cell
38	const reuse = prev?.find((_c) => _c.dependencies?.[0] === cell.id);	34✔
39	if (reuse !== undefined) set.delete(reuse.id);	20✔
40	return (	20✔
41	reuse \|\|
42	// create new map
43	proxy.map(
44	[cell],
45	(_cell) => fn(_cell, index, cell),	10✔
46	`${cell.id}:[${index}]`
47	)
48	);
49	});
50	// collect unused previously mapped cells
51	proxy._sheet.collect(...[...set]);	6✔
52	return res;	6✔
53	},
54	name
55	);
56
57	/**
58	* Compares two values and returns a number indicating their order.
59	*
60	* This function is designed to be used as a comparator in sorting functions.
61	* It returns:
62	* - `1` if `a` is greater than `b`
63	* - `-1` if `a` is less than `b`
64	* - `0` if `a` is equal to `b`
65	*
66	* @param {*} a - The first value to compare.
67	* @param {*} b - The second value to compare.
68	* @returns {number} - Order.
69	*
70	* @example
71	* const array = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5];
72	* array.sort(defaultComparator);
73	*/
74	export const defaultComparator = <T>(a: T, b: T): number =>	1✔
75	a > b ? 1 : a < b ? -1 : 0;	30✔
76
77	/**
78	* implementation of sort for a cellified array.
79	* @description this implementation relies on pointers but reuses the original cells.
80	* @param proxy
81	* @param arr
82	* @param compare comparison function
83	* @param noFail should be true when the following conditions are met:
84	* 1. compare must be defined
85	* 2. cells must be an array (possibly empty)
86	* 3. compare should never fail
87	*/
88	export const sort = <T, NF extends boolean = false>(	1✔
89	proxy: SheetProxy,
90	arr: CellArray<T>,
91	compare: (a: T, b: T) => number = defaultComparator,
92	noFail?: NF
93	): MapCell<typeof arr extends AnyCell<infer U> ? U : never, NF> => {
94	const coll =	3✔
95	collector<MapCell<typeof arr extends AnyCell<infer U> ? U : never, NF>>(
96	proxy
97	);
98	return proxy.mapNoPrevious(	3✔
99	[arr],
100	(cells) =>
101	coll(	6✔
102	proxy.mapNoPrevious(
103	cells,
104	(..._cells) =>
105	_cells	8✔
106	.map((_, index) => index)	27✔
107	.sort((indexA, indexB) => compare(_cells[indexA], _cells[indexB]))	30✔
108	.map((index) => cells[index]),	27✔
109	"_sort",
110	noFail \|\| false
111	)
112	),
113	"sort",
114	noFail \|\| false
115	);
116	};
117
118	/**
119	* mapArrayCell is a variant of `mapArray` with a function taking
120	* element cells as arguments.
121	* @param proxy
122	* @param arr
123	* @param fn
124	* @returns mapped array cell
125	*/
126	export const mapArrayCell = <T, U, NF extends boolean = false>(	1✔
127	proxy: SheetProxy,
128	arr: CellArray<T>,
129	fn: AnyCell<(v: AnyCell<T>, idx?: number) => AnyCell<U>>,
130	name = "map",
131	nf?: NF
132	): MapCell<MapCell<U, NF>[], NF> => {
133	let prevFn: (v: AnyCell<T>) => AnyCell<U>;
134	return proxy.map(	1✔
135	[arr, fn],
136	(cells, _fn, prev) => {
137	const arr = cells.map((cell, i) =>	6✔
138	// @todo collect previously mapped cells
139	reuseOrCreate(
140	_fn === prevFn, // function unchanged
141	() => prev?.find((_c) => _c.dependencies?.[0] === cell.id), // reuse	×
142	() => _fn(cell, i) as MapCell<U, NF> // create new map	6✔
143	)
144	);
145	prevFn = _fn;	2✔
146	return arr;	2✔
147	},
148	name,
149	nf
150	);
151	};
152
153	/**
154	* first element of recursive arrays.
155	*/
156	export const first = <T>(	1✔
157	proxy: SheetProxy,
158	arr: AnyCell<T \| AnyCell<T>[]>,
159	name = "last"
160	): MapCell<T, boolean> => {
161	// @todo collectors (on path?)
162	const aux = (arr: AnyCell<T \| AnyCell<T>[]>) =>	1✔
163	proxy.mapNoPrevious(	2✔
164	[arr],
165	(_arr) => {
166	if (!Array.isArray(_arr)) return arr as AnyCell<T>;	2✔
167	if (_arr.length === 0) return null; // @todo pointer to nullCell?	1✔
168	return aux(_arr[0]);	1✔
169	},
170	name
171	);
172	return aux(arr);	1✔
173	};
174
175	/**
176	* last element of recursive arrays.
177	*/
178	export const last = <T>(	1✔
179	proxy: SheetProxy,
180	arr: AnyCell<T \| AnyCell<T>[]>,
181	name = "last"
182	): MapCell<T, boolean> => {
183	// @todo collectors (on path?)
184	const aux = (arr: AnyCell<T \| AnyCell<T>[]>) =>	1✔
185	proxy.mapNoPrevious(	2✔
186	[arr],
187	(_arr) => {
188	if (Array.isArray(_arr)) return aux(_arr[_arr.length - 1]);	2✔
189	return arr as AnyCell<T>;	1✔
190	},
191	name
192	);
193	return aux(arr);	1✔
194	};
195
196	/**
197	* reduce a cellified array.
198	* @param proxy
199	* @param arr
200	* @param fn
201	* @param init
202	* @returns reduced cell
203	*/
204	export const reduce = <	1✔
205	T,
206	R extends unknown \| Promise<unknown>,
207	NF extends boolean = false
208	>(
209	proxy: SheetProxy,
210	arr: CellArray<T>,
211	fn: (acc: R, elt: T, index?: number, cell?: AnyCell<T>) => R,
212	init: R,
213	name = "reduce",
214	nf?: NF
215	): MapCell<R, NF> => {
216	const coll = collector<MapCell<R, NF>>(proxy);	2✔
217	return proxy.map(	2✔
218	[arr],
219	(cells) =>
220	coll(	5✔
221	proxy.mapNoPrevious(
222	cells,
223	(..._cells) =>
224	_cells.reduce((acc, elt, i) => fn(acc, elt, i, cells[i]), init),	23✔
225	"_reduce"
226	)
227	),
228	name,
229	nf
230	);
231	};
232
233	export const find = <T, NF extends boolean = false>(	1✔
234	proxy: SheetProxy,
235	arr: CellArray<T>,
236	predicate: (v: T) => boolean,
237	name = "find",
238	nf?: NF
239	) => {
240	const coll = collector<MapCell<T, NF>>(proxy);	1✔
241	return proxy.map(	1✔
242	[arr],
243	(cells) =>
244	coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.find(predicate))),	1✔
245	name,
246	nf
247	);
248	};
249
250	export const findIndex = <T, NF extends boolean = false>(	1✔
251	proxy: SheetProxy,
252	arr: CellArray<T>,
253	fn: (v: T) => boolean,
254	name = "find",
255	nf?: NF
256	) => {
257	const coll = collector<MapCell<number, NF>>(proxy);	1✔
258	return proxy.map(	1✔
259	[arr],
260	(cells) =>
261	coll(proxy.mapNoPrevious(cells, (..._cells) => _cells.findIndex(fn))),	2✔
262	name,
263	nf
264	);
265	};
266
267	/**
268	* filter updates a cellified array in a `ValueCell` using a predicate function as filter.
269	* @param arr
270	* @param predicate function that returns `true` for kept values.
271	* @returns nothing
272	* @description filtered out cells are _not_ deleted
273	*/
274	export const filter = <T, NF extends boolean = false>(	1✔
275	proxy: SheetProxy,
276	predicate: AnyCell<(elt: T) => boolean>,
277	arr: CellArray<T>,
278	name = "filter",
279	nf?: NF
280	) => {
281	const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);	1✔
282	return proxy.map(	1✔
283	[predicate, arr],
284	(fn, cells) =>
285	coll(	2✔
286	proxy.mapNoPrevious(
287	cells,
288	(..._cells) => cells.filter((_, i) => fn(_cells[i])),	9✔
289	"_filter"
290	)
291	),
292	name,
293	nf
294	);
295	};
296
297	/**
298	* `flattenCellArray` is a utility function that maps and flattens an array
299	* of cells into a single cell that contains a flattened array of values.
300	* It creates a new cell that reacts to changes in the input array and updates
301	* its value accordingly.
302	*
303	* @template T - The type of the elements in the input cell array.
304	* @template NF - Type indicating if the cells are failsafe.
305	*
306	* @param {SheetProxy} proxy - An instance of `SheetProxy` used to create new
307	* cells and manage dependencies.
308	* @param {CellArray<T>} arr - An array of cells, where each cell contains a
309	* value of type `T`.
310	* @param {string} [name="flatten"] - An optional name for the resulting cell.
311	* Defaults to "flatten".
312	* @param {NF} [nf] - An optional flag indicating whether the cells can't fail.
313	* Defaults to `false`.
314	*
315	* @returns {MapCell<T[], NF>} - A cell containing a flattened array of values.
316	*/
317	export const flattenCellArray = <T, NF extends boolean = false>(	1✔
318	proxy: SheetProxy,
319	arr: CellArray<T>,
320	name = "flatten",
321	nf?: NF
322	) => {
323	const coll = collector<MapCell<T[], NF>>(proxy);	×
324	return proxy.mapNoPrevious(	×
325	[arr],
326	(cells) =>
327	cells === null	×
328	? null
329	: coll(proxy.mapNoPrevious(cells, (..._cells) => _cells)),	×
330	name,
331	nf
332	);
333	};
334
335	/**
336	* filterPredicateCell updates a cellified array in a `ValueCell` using a predicate function as filter.
337	* @param arr
338	* @param predicate as Cell function that returns `true` for kept values.
339	* @returns nothing
340	* @description filtered out cells are _not_ deleted
341	*/
342	export const filterPredicateCell = <T, NF extends boolean = false>(	1✔
343	proxy: SheetProxy,
344	predicate: AnyCell<(elt: AnyCell<T>) => AnyCell<boolean>>,
345	arr: CellArray<T>,
346	name = "filter",
347	nf?: NF
348	) => {
349	const coll = collector<MapCell<AnyCell<T>[], NF>>(proxy);	1✔
350	// Since predicate is a reactive function, we have to instantiate
351	// the computation for each cell.
352	// const keep = mapArrayCell(proxy, arr, predicate, "keep", nf);
353	let prevFn: (elt: AnyCell<T>) => AnyCell<boolean>;
354	const keep = proxy.map(	1✔
355	[predicate, arr],
356	(fn, cells, _prev: AnyCell<boolean>[]) => {
357	// console.log({ keep: cells.length });
358	// @todo if the predicate function has changed, collect previous mapped cells
359	const keep = cells.map((cell) => {	2✔
360	// We can reuse a cell only if the predicate hasn't changed.
361	// @todo collect previously mapped cells for deleted cells in arr
362	const reuse =
363	prevFn === fn &&	6✔
364	_prev?.find((_c) => _c.dependencies?.[0] === cell.id);	×
365	return reuse \|\| fn(cell);	6✔
366	});
367	prevFn = fn;	2✔
368	return keep;	2✔
369	},
370	"keep",
371	nf
372	);
373	return proxy.map(	1✔
374	[arr, keep],
375	(cells, _keep) =>
376	coll(	2✔
377	proxy.mapNoPrevious(
378	_keep,
379	(..._flat) => cells.filter((_, i) => _flat[i]),	6✔
380	"filter.map"
381	)
382	),
383	name,
384	nf
385	);
386	};

okcontract / cells / 20256130503

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