: member? ( elt seq -- ? )
    [ = ] with any? ;

: member-of? ( seq elt -- ? )
    [ = ] curry any? ;

: member-eq? ( elt seq -- ? )
    [ eq? ] with any? ;

: member-eq-of? ( seq elt -- ? )
    [ eq? ] curry any? ;

: remove ( elt seq -- newseq )
    [ = ] with reject ;

: remove-of ( seq elt -- newseq )
    [ = ] curry reject ;

: remove-eq ( elt seq -- newseq )
    [ eq? ] with reject ;

: remove-eq-of ( seq elt -- newseq )
    [ eq? ] curry reject ;