twoto
0
x1
p
p
s
s
s
p
p
p
s
s
s
0
p
p
s
s
x1
twoto
s
x1
p
p
s
s
p
p
p
s
s
s
twice
p
p
s
s
p
p
p
s
s
s
twoto
p
s
p
s
x1
twice
0
x1
p
s
p
s
0
s
p
s
s
s
s
p
s
x1
twice
s
x1
s
p
p
p
p
s
s
s
s
s
twice
p
s
p
s
p
s
p
s
x1
p
p
s
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p
s
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p
0
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0
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s
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s
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0
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twoto
1
0
1
p
1
s
1
twice
1
FULL
./SRS/secret06/aprove05.srs