Original:
false
false
true
false
false
false

Flipflop:
Argument "" isn't numeric in numeric gt (>) at test.pl line 21, <$fh> line 1.
false
Argument "" isn't numeric in numeric gt (>) at test.pl line 21, <$fh> line 2.
false
false
true
true
true

Flag:
false
false
true
false
false
false