How to find Minimal Cover

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How to calculate minimal cover of a given set of functional dependencies.
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procedure is correct but no clarity in example

BiswajitJena_chandu
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Consider a given relation R=(P, Q, R, S) with following set of
FDs: PQ→R
PS→Q
QS→P
PR→Q
S→R
Find the minimal set of FDs from the above set.

Please help

nitingovil