     }
 } ;
 
-{ append append-as } related-words
+{ append append-as append! 3append 3append-as push-all } related-words
 
 HELP: prepend
 { $values { "seq1" sequence } { "seq2" sequence } { "newseq" sequence } }

    }
} ;

{ 3append 3append-as } related-words

HELP: surround
{ $values { "seq1" sequence } { "seq2" sequence } { "seq3" sequence } { "newseq" sequence } }
{ $description "Outputs a new sequence with " { $snippet "seq1" } " inserted between " { $snippet "seq2" } " and " { $snippet "seq3" } "." }

    }
}
{ $errors "Throws an error if the index is out of bounds." } ;

{ tail tail* tail-slice tail-slice* } related-words
{ head head* head-slice head-slice* } related-words
{ cut cut* cut-slice } related-words
{ unclip unclip-slice unclip-last unclip-last-slice } related-words
{ first last but-last but-last-slice rest rest-slice } related-words

HELP: shorter?
{ $values { "seq1" sequence } { "seq2" sequence } { "?" boolean } }
