perl -le '@x = qw(a b c d e f);
            @y = qw(a d f);
            $n = grep { $e = $_; not grep { $e =~ /\Q$_/i } @x } @y;
            print "Count of elements in (@y) that are NOT present in (@x) = $n"
           '
Count of elements in (a d f) that are NOT present in (a b c d e f) = 0

##</code><code>##

____DATA_____
b c a
a c d
d e b
e f g
g d f
h i g

##</code><code>##

a b c
a b d c
e f d g

##</code><code>##

component 1 = a b c
induced = b c a
component = a b d c
induced = b c a
a c d
component 3 = e f d g
induced = e f g
g d f