===INIT===
string(1) "A"
string(1) "C"
string(1) "C"
===SetA===
string(2) "A2"
string(1) "C"
string(1) "C"
===SetB===
string(2) "A2"
string(2) "B2"
string(2) "B2"
===SetC===
string(2) "A2"
string(2) "C2"
string(2) "C2"