/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
Scanner sc
= new Scanner
(System.
in); int t = sc.nextInt();
for(int i=0;i<t;i++){
int x = sc.nextInt();
int y = sc.nextInt();
int num = (x-(2*y));
if(num%3==0 && num>=0){
if(y>=0){
}
else{
if(num/3>=(-2*y)){
}
else{
}
}
}
else{
}
}
}
}
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