/Я language (β)/Primitives/Prefix List/

: Supertype ( Prefix List i ii ) ~ ( List ( Along i ii ) )
: Basetype ( Prefix List i ii ) ~ ( Unit `S` ( Nonempty List ( Along i ii ) ) )

> `yo` : a o . Prefix List i a `AR_____` a `AR____` o `AR____` Prefix List i o