add rember-f Chap08 p128 L1
modify rember-f Chap08 p123 L2
add eq?-c Chap08 p129 L8
add eq?-salad Chap08 p130 L2
modify rember-f Chap08 p130 L6
add rember-eq? Chap08 p131 L2
modify rember-f Chap08 p131 L5