add olength (length) Chap04 p78 L3
add pick Chap04 p78 L6
add rempick Chap04 p79 L1
add no-nums Chap04 p79 L5
add all-nums Chap04 p80 L1
add eqan? Chap04 p80 L2
add occur Chap04 p80 L4
add one? Chap04 p81 L1, 1
modify one? Chap04 p81 L1, 2
modify one? Chap04 p81 L2
modify rempick Chap04 p81 L3