-- if you Fusion Summon a DARK Fusion Monster, you can also use cards in your Pendulum Zones as monsters on the field, as material for its Fusion Summon.
-- as of 2025 May, there is no card can add LOCATION_MZONE base on material group. So we can just check pre_select_mat_location.
e1:SetLabel(0xff,LOCATION_MZONE)--- only avaliable when pre_select_mat_location contains LOCATION_MZONE, 1st number is limitaion of count materials, set 0xff as a placeholder