add set? Chap07 p113 L4
modify set? chap07 p113 L5
add makeset Chap07 p114 L2
modify makeset Chap07 p114 L5
add subset? Chap07 p115 L5
modify subset? Chap07 p115 L6
modify subset? Chap07 p116 L1
add eqset? Chap07 p116 L3
modify eqset? Chap07 p116 L4
modify eqset? Chap07 p116 L5
add intersect? Chap07 p117 L1
modify intersect? Chap07 p117 L2
modify intersect? Chap07 p117 L3
add intersect Chap07 p118 L1