The tag implication #53259 yes_pillow -> yes-no_pillow has been approved.
Reason: Yes_pillow is actually one side of a two-sided pillow, the other being no_pillow. The yes-no_pillow wiki page has details.
EDIT: The tag implication yes_pillow -> yes-no_pillow (forum #386152) has been approved by @slyroon.
Updated by auto moderator