XS= {XS1, ..., XSM−L, XM−L+1, ..., XM}OF A B S I AND ∀X S J , X S J0 ∈...

5: X

s

= {x

s1

, ..., x

sm−l

, x

m−l+1

, ..., x

m

}

of a B s i and ∀x s j , x s j0 ∈ B i s , y s j = y s j0 = y B

is

, where