rule bug in oclHashCat-plus?

[kefir]

Hi, I'm trying to understand the rules, and while reading some, I saw this in the file rules/best64.rule:

Code:

## high frequency overwrite at start
o0d
o0m o1a
o0t o0b

Surely the last entry here is wrong? There's no point replacing the first character first with a t, and then replacing that with a b again?