The bulk update request #6798 is pending approval.
create implication hair_bun (9680) -> tied_hair (7501)
create implication pigtails (18999) -> tied_hair (7501)
create implication ponytail (76443) -> tied_hair (7501)
Reason: tied_hair is a tag that could get more use, all of those hairstyle feature tied hair by definition so tied_hair could become an umbrella term for all tied hairstyles.
That way, tied_hair could more prominently become the general tag for edge cases/more esoteric hairstyles that feature tied hair that aren't quite one of the main hairstyles.