(Harry, this is actually a hint to 10B: read the initial letters of each sentence. You may wish to post this or not, I leave it to your discretion.)
If you are stuck on 10B, here is a free-verse poem to see you through!
Cryptography was beginning to destroy(?) me on Challenge 10B.
And the days came and went with no breakthrough.
Defeat was imminent.
Evidently, though, a ‘hint’ (well, suggestion) came up in this forum.
Not one to give up easily, I persued the advice.
Usurping the cryptic message was a triumph!
So can you find meaning in my rambling?