-HELP: ?nth-of
-{ $values { "seq" sequence } { "n" integer } { "elt/f" { $maybe object } } }
-{ $description "A forgiving version of " { $link nth-of } ". If the index is out of bounds, or if the sequence is " { $link f } ", simply outputs " { $link f } "." } ;
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-HELP: ??nth-of
-{ $values { "seq" sequence } { "n" integer } { "elt/f" { $maybe object } } { "?" boolean } }
-{ $description "A forgiving version of " { $link nth-of } ". If the index is out of bounds, or if the sequence is " { $link f } ", simply outputs " { $link f } ". Also outputs a boolean to distinguish between the sequence containing an " { $link f } " or an out of bounds index." } ;
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-{ nth ?nth ??nth nth-of ?nth-of ??nth-of } related-words