We read every piece of feedback, and take your input very seriously.
To see all available qualifiers, see our documentation.
?x: Returns the distinct elements of x.
?x
?15 10 15 20 30 30 15 10 20 30 ?"when in the course" "when itcours" ?(1 1 1;2 2 2;1 1 1) (1 1 1 2 2 2)