unalias sounding -> urethral
alias sounding -> object_in_urethra
implicate object_in_urethra -> urethral_penetration
I've been seeing posts incorrectly tagged with just urethral (just search urethral -urethral_penetration), and I think it might be because of this alias. urethral is a catch-all tag, sounding should be object_in_urethra, which should imply urethral_penetration, which already implies urethral.
Alternately, sounding could be aliased to urethral_penetration instead.
I was trying to make this a BUR, but I'm getting "Error: Antecedent name has already been taken (create alias sounding -> object_in_urethra)", and I'm not sure what to do about that.