APPLY template inputlist

Runs the template, filling its slots with the members of inputlist. The number of members in inputlist must be an acceptable number of slots for template. It is illegal to apply the primitive TO as a template, but anything else is okay. APPLY outputs what template outputs, if anything.

APPLY is similar to INVOKE except that APPLY's inputs are provided as a list rather than as separate expressions.

SHOW APPLY "SUM [1 2 3]
6