Ψ Ψ 0 := C a b c d l a m b l c m d , Ψ Ψ 1 := C a b c d l a n b l c m d , Ψ Ψ 2 := C a b c d l a m b m ¯ ¯ c n d , Ψ Ψ 3 := C a b c d l a n b m ¯ ¯ c n d , Ψ Ψ 4 := C a b c d n a m ¯ ¯ b n c m ¯ ¯ d .