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"a","a_1","a_2","x","x_1","x_2"
1,"0,1","1,1",10,"0,1","1,1"
2,"0,2","1,2",11,"0,2","1,2"
3,"0,3","1,3",12,"0,3","1,3"
4,"0,4","1,4",13,"0,4","1,4"
5,"0,5","1,5",14,"0,5","1,5"