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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | \DOC butlast
\TYPE {butlast : (* list -> * list)}
\SYNOPSIS
Computes the sub-list of a list consisting of all but the last element.
\DESCRIBE
{butlast [x1;...;xn]} returns {[x1;...;x(n-1)]}.
\FAILURE
Fails if the list is empty.
\SEEALSO
last, hd, tl, el, null.
\ENDDOC
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