| 1 | 11. ( < hyp,x1.(M @ N) > ) < ( < hyp,M @ (x1  x2.N) > ) 
( L:Sequent List.
s L.( (s) = 0)
& ( s L.|= s  |= < hyp,x1.(M @ N) > )
& ( a:Assignment. s L.a | s  a | < hyp,x1.(M @ N) > )) 12. ( < hyp,x2.(M @ N) > ) < ( < hyp,M @ (x1  x2.N) > ) 
( L:Sequent List.
s L.( (s) = 0)
& ( s L.|= s  |= < hyp,x2.(M @ N) > )
& ( a:Assignment. s L.a | s  a | < hyp,x2.(M @ N) > )) L:Sequent List.
s L.( (s) = 0)
& ( s L.|= s  |= < hyp,M @ (x1  x2.N) > )
& ( a:Assignment. s L.a | s  a | < hyp,M @ (x1  x2.N) > ) |