BUR #31866 has been approved by @nonamethanks.
create implication gyakushuu -> gyakushuu_(series)
create implication gyakushuu_2 -> gyakushuu_(series)
create implication gyakushuu_3 -> gyakushuu_(series)
create implication gyakushuu_4 -> gyakushuu_(series)
create implication gyakushuu_5 -> gyakushuu_(series)
Each entry should imply the series as a whole.