merge Zero and Semigroup in the Monoid
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Key: SANDBOX-404
URL: https://issues.apache.org/jira/browse/SANDBOX-404
Project: Commons Sandbox
Issue Type: Improvement
Components: Graph
Reporter: Simone Tripodi
As discussed on {{dev@}}, {{Zero}}, {{Semigroup}} and {{Monoid}} can be merged
directly in one single interface
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