func (x *Imp) Defined(s string) bool {
//
for b := uint(0); b < x.num; b++ {
if str.IsEquivPart0(s, x.s[x.f][b]) {
x.b = byte(b)
return true
}
}
return false
}
func (x *Imp) IsEquivalentPart(Y Object) bool {
//
return str.IsEquivPart0(x.content, x.imp(Y).content)
}