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The Lion and The Grateful Mouse 

A ___ was preparing to eat a mouse it had just caught. 

'Let me go,' the ___ begged him, 'sooner or later you may need my help.' 

The king of the forest found this idea so ridiculous that he laughed aloud, but he let the ___  mouse go anyway. 

Some time later, the lion was trapped in a net which had been set down by the ___. Then along came the mouse that chewed the netting and freed him. 

'As you can see,' said the mouse, 'even the mighty sometimes need the ___ of the weak.'