Appendix C. Leadhead Codes

A.
Leadhead Grouping
1.

Methods that have a first leadhead that is the same as one of the leadheads found in the Plain Course of Plain Bob or Grandsire have been assigned a code according to the order in which the leadheads occur in its Plain Course. They are a useful shorthand for communicating the Lead order of a Method.

Originally lowercase letters were ascribed and these were later extended with numbers to cover higher stages. In the framework the codes associated with the letters p, q, r and s have been renumbered to include the leadheads previously omitted before the Differential classes were added.

Methods with Plain Bob leadheads are split into different leadhead groups according to the place notation (where n is the Stage) immediately before the leadhead as follows:

  • Those with even Stages and a lead end place notation of 12 have codes a-f
  • Those with even Stages and a lead end place notation of 1n have codes g-m
  • Those with odd Stages and a lead end place notation of 12n have codes p-q
  • Those with odd Stages and a lead end place notation of 1 have codes r-s

Methods with Grandsire leadheads are split into different leadhead groups according to the place notation (where n is the Stage) immediately after the leadhead as follows:

  • Those with odd Stages and a place notation of 3 following the leadhead have codes a-f
  • Those with odd Stages and a place notation of n following the leadhead have codes g-m
  • Those with even Stages and a place notation of 3n following the leadhead have codes p-q
  • Those with even Stages and a place notation of - following the leadhead have codes r-s

Any methods not falling in the above groupings are not given a leadhead code even if they have Plain Bob or Grandsire leadheads.

B.
Plain Bob Leadhead Codes for Even Stages
LH Code
Minimus
Minor
Major
Royal
Maximus
Fourteen
Sixteen
PN12
PN1n
a
g
1342
135264
13527486
1352749608
13527496E8T0
13527496E8A0BT
13527496E8A0CTDB
b
h
156342
15738264
1573920486
157392E4T608
157392E4A6B8T0
157392E4A6C8D0BT
c
j
17856342
1795038264
1795E3T20486
1795E3A2B4T608
1795E3A2C4D6B8T0
c1
j1
1907856342
19E7T5038264
19E7A5B3T20486
19E7A5C3D2B4T608
c2
j2
1ET907856342
1EA9B7T5038264
1EA9C7D5B3T20486
c3
j3
1ABET907856342
1ACED9B7T5038264
c4
j4
1CDABET907856342
d4
k4
1DBCTA0E89674523
d3
k3
1BTA0E89674523
1BTD0C8A6E492735
d2
k2
1T0E89674523
1T0B8A6E492735
1T0B8D6C4A2E3957
d1
k1
1089674523
108T6E492735
108T6B4A2E3957
108T6B4D2C3A5E79
d
k
18674523
1860492735
18604T2E3957
18604T2B3A5E79
18604T2B3D5C7A9E
e
l
164523
16482735
1648203957
1648203T5E79
1648203T5B7A9E
1648203T5B7D9CEA
f
m
1423
142635
14263857
1426385079
142638507T9E
142638507T9BEA
142638507T9BEDAC

C.
Plain Bob Leadhead Codes for Odd Stages
LH Code
Doubles
Triples
Caters
Cinques
Sextuples
Septuples
Octuples
PN12n
PN1
p
r
13524
1352746
135274968
13527496E80
13527496E8A0T
13527496E8A0CTB
13527496E8A0CTFBD
p1
r1
15432
1573624
157392846
157392E4068
157392E4A6T80
157392E4A6C8B0T
157392E4A6C8F0DTB
p2
r2
1765432
179583624
1795E302846
1795E3A2T4068
1795E3A2C4B6T80
1795E3A2C4F6D8B0T
p3
r3
198765432
19E70583624
19E7A5T302846
19E7A5C3B2T4068
19E7A5C3F2D4B6T80
p4
r4
1E098765432
1EA9T70583624
1EA9C7B5T302846
1EA9C7F5D3B2T4068
p5
r5
1ATE098765432
1ACEB9T70583624
1ACEF9D7B5T302846
p6
r6
1CBATE098765432
1CFADEB9T70583624
p7
r7
1FDCBATE098765432
q6
s6
1DBFTC0A8E6947253
q5
s5
1BTC0A8E6947253
1BTD0F8C6A4E29375
q4
s4
1T0A8E6947253
1T0B8C6A4E29375
1T0B8D6F4C2A3E597
q3
s3
108E6947253
108T6A4E29375
108T6B4C2A3E597
108T6B4D2F3C5A7E9
q2
s2
186947253
18604E29375
18604T2A3E597
18604T2B3C5A7E9
18604T2B3D5F7C9AE
q1
s1
1647253
164829375
1648203E597
1648203T5A7E9
1648203T5B7C9AE
1648203T5B7D9FECA
q
s
14253
1426375
142638597
142638507E9
142638507T9AE
142638507T9BECA
142638507T9BEDAFC

D.
Grandsire Leadhead Codes for Odd Stages
LH Code
Doubles
Triples
Caters
Cinques
Sextuples
Septuples
Octuples
PN3
PNn
a
g
12534
1253746
125374968
12537496E80
12537496E8A0T
12537496E8A0CTB
12537496E8A0CTFBD
b
h
1275634
127593846
127593E4068
127593E4A6T80
127593E4A6C8B0T
127593E4A6C8F0DTB
c
j
129785634
1297E503846
1297E5A3T4068
1297E5A3C4B6T80
1297E5A3C4F6D8B0T
c1
j1
12E90785634
12E9A7T503846
12E9A7C5B3T4068
12E9A7C5F3D4B6T80
c2
j2
12AET90785634
12AEC9B7T503846
12AEC9F7D5B3T4068
c3
j3
12CABET90785634
12CAFED9B7T503846
c4
j4
12FCDABET90785634
d4
k4
12DFBCTA0E8967453
d3
k3
12BCTA0E8967453
12BDTF0C8A6E49375
d2
k2
12TA0E8967453
12TB0C8A6E49375
12TB0D8F6C4A3E597
d1
k1
120E8967453
120T8A6E49375
120T8B6C4A3E597
120T8B6D4F3C5A7E9
d
k
128967453
12806E49375
12806T4A3E597
12806T4B3C5A7E9
12806T4B3D5F7C9AE
e
l
1267453
126849375
1268403E597
1268403T5A7E9
1268403T5B7C9AE
1268403T5B7D9FECA
f
m
12453
1246375
124638597
124638507E9
124638507T9AE
124638507T9BECA
124638507T9BEDAFC

E.
Grandsire Leadhead Codes for Even Stages
LH Code
Minimus
Minor
Major
Royal
Maximus
Fourteen
Sixteen
PN3n
PN-
p
r
125364
12537486
1253749608
12537496E8T0
12537496E8A0BT
12537496E8A0CTDB
p1
r1
12758364
1275930486
127593E4T608
127593E4A6B8T0
127593E4A6C8D0BT
p2
r2
1297058364
1297E5T30486
1297E5A3B4T608
1297E5A3C4D6B8T0
p3
r3
12E9T7058364
12E9A7B5T30486
12E9A7C5D3B4T608
p4
r4
12AEB9T7058364
12AEC9D7B5T30486
p5
r5
12CADEB9T7058364
q6
s6
12DCBATE09876543
q5
s5
12BATE09876543
12BDTC0A8E694735
q4
s4
12TE09876543
12TB0A8E694735
12TB0D8C6A4E3957
q3
s3
1209876543
120T8E694735
120T8B6A4E3957
120T8B6D4C3A5E79
q2
s2
12876543
1280694735
12806T4E3957
12806T4B3A5E79
12806T4B3D5C7A9E
q1
s1
126543
12684735
1268403957
1268403T5E79
1268403T5B7A9E
1268403T5B7D9CEA
q
s
1243
124635
12463857
1246385079
124638507T9E
124638507T9BEA
124638507T9BEDAC