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