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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | \DOC isl
\TYPE {isl : ((* + **) -> bool)}
\SYNOPSIS
Tests for membership of left summand.
\EXAMPLE
{
#let x = inl 1 and y = inr 2;;
#isl x;;
true : bool
#isl y;;
false : bool
}
\SEEALSO
inl, inr
\ENDDOC
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