private function contains(array $system, array $set): bool
    {
        return (bool) array_filter($system, function ($entry) use ($set) {
            return $this->equals($entry, $set);
        });
    }
private function contains(array $system, array $set): bool
    {
        return (bool) array_filter($system, function ($entry) use ($set) {
            return $this->equals($entry, $set);
        });
    }
private function contains ( array $ system , array $ set ) : bool { return ( bool ) array_filter ( $ system , function ( $ entry ) use ( $ set ) { return $ this -> equals ( $ entry , $ set ) ; } ) ; }
Returns true if set is an element of system.

@see \Phpml\Association\Apriori::equals()

@param mixed[][] $system
@param mixed[]   $set
Returns true if set is an element of system .