(true proj(length(4),[](dc)),length(15))&true,(length(3),@ <>ac)proj true,(length(5),@ <>bc)proj true,(length(5),@ <>cc)proj true,[]((ac,not(bc),not(cc),not(dc);not(ac),bc,not(cc),not(dc);not(ac),not(bc),cc,not(dc);not(ac),not(bc),not(cc),dc)),true.