Propose syntheses of the following compounds by using Michael additions

Propose syntheses of the following compounds by using Michael additions followed by aldol condensations (i.e., Robinson annulation). Each of the compounds shown has been instrumental in one or more total syntheses of steroidal hormones. 

H;C (а) OCH3 (b) ČO,CH,CH; CH, CH3 (с) CН,0 (d)

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