Basically, the sitemask is the sum of some set of powers of 2. You can decompose one by finding the largest power of 2 that it can be reduced by, and subtracting that off, repeat until you're left with a power of 2. All the powers of 2 you subtracted are the informative bits, and their meanings are in the DB.
__________________
The ignorant shall fall to the squirrels.
--Chip 4:2
thx, i found out the summing procedure.
Could you tell an "optimal" mage's paths who can find the majority of uw sites? for instance, is it worth to start searching later, in exchange for a 2N mage instead of a N1?