a # 1 60 R ' r#drep v                                                   '
a # a,[1]  ' r#((vIv)=IRv)/v#,v                                         '
a # a,[1]  ' $0                                                         '
a # a,[1]  '"drep - select unique elements from any structure.          '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
a # a,[1]  '"useful in preparing special collating sequences.  result   '
a # a,[1]  '"contains single appearance of each element, not rearranged.'
Lfx a