Its a bad example , but it works with the following tweaks:

• Comment out "#$self->SUPER::speak();" in the "speak" method of A (It is a Base class - has no SUPER)
• In Package B, Instead of "use parent A", do "use parent -norequire, 'A';"
• In Package C, Instead of "Use parent B", use "use parent -norequire, 'B';"

The reasons for the "-norequire" are explained in the parent module documentation.

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