So the plan to tax EU banks E30bn is today's latest version of a get-out clause.

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"We've offered him a contract with a get-out clause if someone comes in for him, " Jones said.

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But Johnson has a get-out clause which enables him to leave his post with Australia at the end of the tournament.

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They had argued strongly that being in plain and intelligible language gave them a "get-out" clause.

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