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PS1S2A
S1
S2A
A
S2S1
A
S1
A
S1
S2
S2A
S1
S1
S2S1
P
S1
S2A
S2S1
S1
S2
P
S2
S2
S1
S2
S1
S1
S1
S1
S1
S1
P
PS1
P
P
P
S2
S2
S1S2A
S2
S1P
S2
S2
S1
S2
S2