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define prepend
$prepend_val !
$prepend_phrase !
'[ $prepend_val @ $prepend_phrase @ unphrase '] phrase
$prepend_val forget $prepend_phrase forget
;
define append
$append_val !
$append_phrase !
'[ $append_phrase @ unphrase $append_val @ '] phrase
$append_val forget $append_phrase forget
;
[ 2 3 ] 1 prepend .
[ 2 3 ] 4 append .
[ 1 2 3 ] pop . .
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