Example:

Def(v)

Def(v)

Use(v)

Def(v)

Use(v)

Y.{p}

Y.{p}

Y.{p}

Y.{}

N

Y.{p}

N

Y.{p}

Y.{}

Y.{}

Y.{}

Y.{p}

Y.{p}

Y.{}

no

yes

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