add multirember&co Chap08 p139 L4
add a-friend Chap08 p140 L1
modify multirember&co Chap08 p140 L2
add new-friend Chap08 p141 L1 (left)
modify new-friend Chap08 p141 L1 (right)
modify new-friend Chap08 p141 L2
add latest-friend Chap08 p141 L7
modify multirember&co and add last-friend Chap08 p142 L3