54
ED -> DE
FD -> DF
HDG -> DGH
IDG -> DGI
1DGJ -> DGJ1
GE -> EG
GF -> FG
JH -> HJ
JI -> IJ
DE -> BG
DF -> CG
GH -> EJ
GI -> FJ
J0 -> H
J1 -> I
0 -> DGJ0
1 -> DGJ1
KH -> EK
KI -> FK
MK -> KB
NK -> KC
K -> _
L -> _
BO -> OB
CO -> OC
BP -> PB
CP -> PC
OB -> M
OC -> A
PC -> N
PB -> A
OE -> EO
OF -> FO
PE -> EP
PF -> FP
EO -> M
FO -> A
FP -> N
EP -> A
OO -> M
PP -> N
OP -> A
PO -> A
Q -> _
BE -> OQO
BF -> PQO
CE -> OQP
CF -> PQP
MH -> MKKH
MI -> MKKI
NH -> NKKH
NI -> NKKI
M -> _
N -> _