Secondary Building Units
frequency of occurrence given in parentheses
 3 (5) |
 4 (71) |
 6 (51) |
|
 8 (24) |
 12 (5) |
||
 Spiro-5 (2) |
 4-4 (4) |
 6-6 (10) |
 8-8 (3) |
 4-1 (13) |
 4-[1,1] (5) |
 1-4-1 (7) |
 4-2 (23) |
 4=1 (3) |
 4-4- (4) |
 4-4=1 (3) |
|
 5-1 (25) |
 5-[1,1] (2) |
 1-5-1 (4) |
 5-3 (10) |
 6-2 (16) |
 2-6-2 (16) |
 6*1 (4) |