1 | 9. S:Sequent.
(S) < ( < M @ (f.N),concl > ) 
( L:Sequent List. s L.( (s) = 0) & ( s L.|= s  |= S ) & ( a:Assignment. s L.a | s  a | S)) L:Sequent List.
s L.( (s) = 0)
& ( s L.|= s  |= < M @ (f.N),concl > )
& ( a:Assignment. s L.a | s  a | < M @ (f.N),concl > ) |