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#include <stdio.h>
int T, a , b , i;
int euclid( int a, int b ){
int r;
while( b ){
r = a % b;
a = b;
b = r;
}
return a;
}
int main(){
freopen( "euclid2.in" , "r" , stdin );
freopen( "euclid2.out" , "w" , stdout );
scanf( "%d" , &T );
for( i = 1 ; i <= T ; i++ ){
scanf( "%d %d" , &a , &b );
printf( "%d\n" , euclid( a , b ) );
}
return 0;
}