If you look at the code, he's incrementing the value, but if you look at his data (pasted below), the number to increment is in the key. It's not clear from that data that the left column is a key -- it could be an HoA -- but in the past, he explicitely said the score (the number to increment) is in the key. 
35    forc two bodi twice strong on bodi sai bodi mass 
39    you expect on think new bodi made two bodi origin 
60    attract bodi b origin force
46    total forc b twice origin force
34    sai on bodi twice mass three time mass forc six 
17    on now see why bodi fall same rate bodi twice

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In reply to Re^3: Counting instances in a hash from an array by ikegami
in thread Counting instances in a hash from an array by Gavin

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