int a[] = new int[100];
int b[] = new int[100];
Scanner skan = new Scanner(System.in);
int n = skan.nextInt();
for(int i=1; i<=n; i++){
a[i] = skan.nextInt();
b[i] = skan.nextInt();
}
for(int i=1; i<=n; i++)
System.out.println(((int)Math.pow(a[i], b[i]))%10);
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