S
Size: a a a
S
R
.filterNot(data => data._1.contains(data._2))forallSP
SP
E

SA
.filter { it.first != it.second }Oℕ
Oℕ
.filter { it.first != it.second }SP
Oℕ
E
SP
SP
Oℕ
SP
S
.filterNot(data => data._1.contains(data._2))forallOℕ
S
Option[Option[T]]SA