[squid-users] debug_options reference

Hi all,
I feel like a complete fool but I just can't seem to use the squid
docs... could someone point me to the list of sections? ALL,1 33,2
seems to be a common setting - but wtf is the doc that says what 33
is?!?
Cheers
Anton
ps. Do I have to read through the source for this?

-- 
echo '16i[q]sa[ln0=aln100%Pln100/snlbx]sbA0D4D465452snlbxq' | dc
This will help you for 99.9% of your problems ...