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\DOC subset
\TYPE {subset : 'a list -> 'a list -> bool}
\SYNOPSIS
Tests if one list is a subset of another.
\DESCRIBE
The call {subset l1 l2} returns {true} if every element of {l1} also occurs in
{l2}, regardless of whether an element appears once or more than once in each
list. So when {l1} and {l2} are regarded as sets, this is a subset test.
\FAILURE
Never fails.
\EXAMPLE
{
# subset [1;1;2;2] [1;2;3];;
val it : bool = true
}
\SEEALSO
insert, intersect, set_eq, setify, subtract, union.
\ENDDOC
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