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Relation Many To Zero Or One icon

<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M21 15V13H19V15H18.79A2.5 2.5 0 0 0 14.21 15H13V7H5L3 5H2V11H3L5 9H11V17H14.21A2.5 2.5 0 0 0 18.79 17H19V19H21V17H22V15M16.5 17A1 1 0 1 1 17.5 16A1 1 0 0 1 16.5 17Z"/></svg>