If perversity is not your bag, you can use the IPL routine IndexPDCO from the pdco module.
IndexPDCO{e1, e2} produces the e2-th terms from e1. Thus:
write(IndexPDCO{"a" | "b" | "c" | "d" | "e", 3})
On the other hand, if perversity *is* your bag (growing up is
still on my task list), Clint Jeffery's suggestions are truly
noteworthy.
-- Michael Glass
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