a # 1 60 R ' r#v dt a                                                   '
a # a,[1]  ' r#((-1URa),S/,+/V\`O~aEv)Ya                                '
a # a,[1]  ' $0                                                         '
a # a,[1]  '"dt - delete trailing insignificant characters or values    '
a # a,[1]  '"from ''the apl handbook of techniques'' copyright 1978, ibm. '
a # a,[1]  '"-insignificant characters or values, as defined in v, that '
a # a,[1]  '" appear on the right side of an array, will be dropped.    '
a # a,[1]  '"-the original rank of a will be preserved.                 '
a # a,[1]  '"-an empty array is returned if nothing significant remains.'
Lfx a