p.62: The word 'whoch' appears, which should probably be 'which'.

p.62: In Proof 4.11, it says 'if y and z are non-adjacent'
 twice in a row, where the first one should probably be
 'if y and z are adjacent'.  Later in this proof 'the second
 inequality follows' should be 'the second equality follows'.

p.64: In the paragraph beginning 'Before proceeding...'
the 4.7 should probably be 4.8.

p.71: I think the 1.43 should be 1.54 here.

p.75: 1.43 should probably be 1.54 again