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multisieve, x, y, list, index
Seeks elements of y in x and returns
information about the finds in list and index.
In list are returned the indices to x of the
found elements from y, grouped by element of
y. In index are returned the start index of
each group in x, and the total number of found elements is
appended at the end.
For element number i from y,
list(index(i): index(i + 1) - 1) is equal to
sieve(x eq y(i)).
See also: sieve