User blog comment:QuasarBooster/Everlasting Egrets/@comment-39253344-20190803213847

I don't know if you're completely right about SBCT.

According to Esolang Wiki,

0: Delete the leftmost bit. 1: Goto the next command (say x). If the leftmost bit is 1, copy x to the right end of the string

is BCT, and

0: Delete the leftmost bit. 1: Goto the next command (say x). If the leftmost bit is 1, copy x to the right end of the string. Go to the next command

is SBCT.