sidewaysmilkSort them out on a flat surface, compare the angles on the keys to differentiate. See here: http://keycapsdirect.com/pdfs/DCSFamily.pdf From the quantities of the different rows, looks like the intent is for the top two 1x keys in the thumb cluster to be row 1 and the lower two 1x to be row 2. For future drops, it'd be nice if they included row 3s with homing bars, and I'm not sure what others prefer but I personally think it makes more sense have a numpad + (vertial mount row 2) for the 2x thumb keys instead of the horizontal-mount 2x that came with this.