In the following letter sequence, how many n's are followed by m but not preceded by h ?
a g r h t n m b c n m l b u v n m h e r h
n m g f e h n m e c n m w q a n m h l b
Answer: B
a g r h t n m b c n m l b u v n m h e r h
n m g f e h n m e c n m w q a n m h l b