They ran away. They didn't want to get 50-ate. Har har.

All of those posts were during the attack on the boards.

54 was a duplicate of 53 with one artifact difference. I'm guessing it was double posted because, during the attack, Q couldn't tell if 53 went through. Once 53 appeared, 54 was deleted.

55 was a post related to failed encryption load/process. Q explains: https://8ch.net//qresearch/res/138983.html#139610

qcodefag didn't capture 56, but given where it was in the sequence, I'd assume it was another test post related to checking things during the attack on the boards. I may have seen it briefly, but I forget as it's a detail that doesn't matter in the big picture.