At the start of your turn you MUST stash at least 1 matching pair. If possible, you maystash multiple pairs onto as many different vaults as you like - but you must always playthem in pairs and only during Phase 1. For example, if you have 3 pairs in your handand enough vaults you could stash your entire hand and draw 6 new cards at the end ofyour turn. More details on how to stash are included on the Phase 1 page of yourrulebook.