No one could have written a neat, five-page letter during such 
a bad stretch of track. Sir Near had obviously written the letter 
earlier and was using it as an alibi. 
     Aim's alibi is plausible. If she had been trying to do her 
nails, the polish might have spilled, leaving the red stain on her 
robe. Plus, her manicure might have turned out so badly that she would 
try to hide her hands. 
    There is also nothing wrong with Tim's alibi. The gash on his 
wrist could easily have been caused by the train's violent rocking. 
And, as he said, anyone could have taken his tool-- and punched Cory 
Groaner's ticket. 

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