With your counter in one hand set at zero, begin in the upper left of the drawing by color coding the branch EMT. Color 1/2” EMT circuit with 2#12 red and hit your counter twice. The two counts represent two 1/2” EMT connectors. If the next 1/2” EMT circuit contains 3#12, put the red pencil down and color that circuit with a green pencil. Again, hit your counter twice for two more 1/2” EMT connectors. Although this circuit contains 3#12, it is still 1/2” EMT and will require 1/2” connectors.
Do not attempt to color only the 2#12 circuits and then return to look for 3#12 and 4#12 circuits. Color the circuits with the appropriate colors as you find them.