1,311 (1,313) Stedman Cinques

Lucinda J Woodward
2314567890E  2 13 15 18
21346578E90       a    
2341                  2 |
2143                  s |A
2314                  - |
2413658709E  -  s  s  s
2143              A    
a = 1.5.7.8.10.11.13s.15.16s (20)

For 1313 (treble fixed), call a = 1.5.8s.10.11.13.14.15.16s