(7)  ψ ( s  * 1    , l  * 1     )   T   ψ ( s  * 2    , l  * 2     )  = ( s  * 1    , ⊗ l  * 1     )   T   ( s  * 2    ⊗ l  * 2     )  = s  * 1   T   s  * 2      l  * 1   T   l  * 2