+HELP: ??nth
+{ $values { "n" integer } { "seq" sequence } { "elt/f" { $maybe object } } { "?" boolean } }
+{ $description "A forgiving version of " { $link nth } ". 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." } ;
+
+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 } "." } ;
+
+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." } ;
+
+{ nth ?nth ??nth nth-of ?nth-of ??nth-of } related-words
+