Number of spots and edge spot size
214 = Two spots, one quarter inch wide
212 = Two spots, one half inch wide
314 = Three spots, one quarter inch wide
312 = Three spots, one half inch wide
a = alternating
d = double
4a14 = four spots, alternating colors, quarter inch size (alternating - the 12 o'clock and 6 o'clock spots are the same color and the 3 and 9 o'clock spots are a different color)
3d14 = three spots, double arrangement, quarter inch wide. (double - each edge spot area is actually a half inch with double quarter inch spots together)
4d14 = same as 3d14 but four groups of spots around the chip.

Solid, 414, 412, 3d14, 4d14

414, 214, 614, 6a14, 6a14, 4a14

4a14, 4a14, 414, 314, 6a14, 214