The value is a serialized php array. Further explanation is not really WordPress specific, but here you go — the ‘s’ is the length of the string representation of the succeeding array element (the length of the string in quotes). I.E. in
a:2:{s:12:"twentyeleven";s:7:"/themes";s:9:"twentyten";s:7:"/themes";}
the “12” in s:12 represents the length of twentyeleven.
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