lassie% a.out
start =? 0
days =? 31
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lassie% a.out
start =? 2
days =? 28
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 27 28
lassie% a.out
start =? 1
days =? 28
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 28
lassie% a.out
start =? 2
days =? 31
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lassie% a.out
start =? 0
days =? 28
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lassie% a.out
start =? 0
days =? 36
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 36
lassie% a.out
start =? 9
days =? 14
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  6  7  8  9 10 11 12
 13 14
lassie%