47bb6f7
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function s () { sed -e "s/\($1\)/\1$2\1/g" } s zero 0 |\ s one 1 |\ s two 2 |\ s three 3 |\ s four 4 |\ s five 5 |\ s six 6 |\ s seven 7 |\ s eight 8 |\ s nine 9