from narrowest to widest
XD
XC
XB
XA
X
A
B
C
D
E
F
- between consecutive blocks is .5 degrees (i.e. XD-XC)
- for split type blocks, flipping them gives you the opposite range (i.e. an "XA" block flipped will be an "A"
- so if you use an A and D block you get 1.5degrees (XA-D is 2.5deg)