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The black one maybe a Black Australorp, the white one maybe a White Leghorn, the red ones could either be: Red sex-links (I think you have one of those), Production Reds, or Hatchery quality RIRs.
Yes, a White Leghorn is a medium size bird, so that may be the difference, or that chick was just a little younger than the others as the feed stores get multiple shipments.
I agree your photo indicates a White Leghorn, Black Sexlink or Australorp, 1 Red Sexlink (white trim) and 2 Production Reds (all red/orange).
LofMc