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Hello! The question reads "Draw resonance structures for the trimethylenemethane anion C(CH2)32- in which a central carbon atom is attached to three CH2 groups (CH2 groups are referred to as methylene).
So basically you have the centralized carbon atom attached to the three methylene groups. Two of the methylene groups are attached to the central carbon with a single C---C bond and have a lone electron pair on the carbon. The third methylene group is attached with a double C==C bond and there are no lone pairs. The resonance structures just switch up which methylene group has the double bond.
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