Question: décomposition of partition Sub-Set

hi 

if I have two partition Pi and Pi 'I want to know the decomposition of Pi' by elementsof Pi if possible,

Example:tition

Pi = {{1,3},{2},{4,6},{5}}

Pi' = {{1,2,3},{4,6},{5}}


=> sought to determine q=3

                                   Pi'={{1,3} union {2},{4,6},{5}}

                                   and the nember 2 = Card({1,3} union {2}) 


haw do this .

thinks


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