conductors
!
S
I
S
!
C
C
S
!
S
I
N
C
S
N
N
!
I
C
!
N
N
C
I
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Start
!
History
Start
!
S
I
S
!
C
C
S
!
S
I
N
C
S
N
N
!
I
C
!
N
N
C
I
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