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A diminshed triad is stacked minor thirds, so do B diminshed it would be B D and F. In principle basic chords are build around triads so you need three notes to make up the chord. From the definition of a diminished triad you know you need a note a minor third apart and a tritone apart (two minor thirds). When you go up a minor third from B you get a D, if you then go up a minor third again you get an F so it's B D F
