Yesterday I wrote that I next thing which I will research are n-ary funcoids and n-ary reloids.
It seems that (n+m)-ary funcoid can be split into a funcoid acting from n-ary funcoids to m-ary funcoids (similarly to (n+m)-ary relation can be split into a binary relation between n-ary tuples and m-ary tuples). But this funcoid is not strictly a funcoid as I define funcoids. It is a pointfree funcoid which I have not yet researched.
Previously I wrote that the topic of pointfree funcoids is somehow not important and boring. But it seems that indeed now I should dig into this topic.