42
ED -> DE
FD -> DF
1DG -> DG1
GE -> EG
GF -> FG
DE -> BG
DF -> CG
G0 -> E
G1 -> F
0 -> DG0
1 -> DG1
JH -> HB
KH -> HC
H -> _
I -> _
BL -> LB
CL -> LC
BM -> MB
CM -> MC
LB -> J
LC -> A
MC -> K
MB -> A
LE -> EL
LF -> FL
ME -> EM
MF -> FM
EL -> J
FL -> A
FM -> K
EM -> A
LL -> J
MM -> K
LM -> A
ML -> A
N -> _
BE -> LNL
BF -> MNL
CE -> LNM
CF -> MNM
J -> _
K -> _