a[s0]: x
b[s0]: x
a[s1]: x
b[s1]: x
a[s2]: x
b[s2]: x
c[s3]: 1
d[s3]: 0
c[s4]: 1
d[s4]: 0
ap[s0]: x
bp[s0]: x
ap[s1]: x
bp[s1]: x
ap[s2]: x
bp[s2]: x
cp[s3]: 1
dp[s3]: 0
cp[s4]: 1
dp[s4]: 0
ar[s0]: x
br[s0]: x
ar[s1]: x
br[s1]: x
ar[s2]: x
br[s2]: x
cr[s3]: 1
dr[s3]: 0
cr[s4]: 1
dr[s4]: 0
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