#1 difference between ex6 and ex7

[Philip Ogren]

example 7 seems to be the same as example 6 except there is an extra vowel. It does not seem to contrast with example 6 in the expected way given the description - i.e. both examples contain 1","2. Actually, I just noticed that ex6 has a space that ex7 does not have. Very tricky! Please consider revising.