add member* Chap05 p89 L1
add leftmost Chap05 p90 L4
add eqlist? Chap05 p93 L2
modify eqlist? Chap05 p94 L4
add eequal? (equal?) Chap05 p95 L1
modify oequal? (equal?) Chap05 p95 L5
modify eqlist? Chap05 p96 L1
modify rember Chap05 p96 L3 (left)
modify rember Chap05 p96 L3
modify rember Chap05 p97 L3