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my %rules = (
     a => [ 'b', 'c' ],
...
     e => [ 'b', 'a' ],
     f => undef,
);

my %rules = (
     a => [ 'b' ],
...
     e => [ 'a' ],
     f => undef,
);

my %rules = (
     a => [ 'b' ],
...
     e => [ 'b' ],
     f => undef,
);