The single letter tags have been claimed by @godo and his network.

#pirates

#treasure = x sometime in the next 30 days

The oceans of steem decoded

#TL ___ #A #B #C #D #E
#IO ___ #F #G #H #I #J
#TPO ___ #K #L #M #N #O
#AO_____ #p #q #r #s #t
#TAO___#U #V #W #X #Y + z don't ever go to (hashtag)z !

edit in progress