import sys
from collections import defaultdict
input = sys.stdin.readline
def main():
    T = int(input())

    for _ in range(T):
        L,R = input().split()
        L = str(int(L)-1)
        L_keta,R_keta = len(L), len(R)

        memo = defaultdict(int)
        def f(n, MAX, giri, R, R_keta):
            if(n == R_keta):return MAX
            if((n,MAX,giri) in memo):return memo[(n,MAX,giri)]
            ret = 0
            if(giri):
                for i in range(int(R[n])+1):
                    ret += f(n+1, max(MAX, i), int(R[n]) == i, R, R_keta)
            else:
                ret += f(n+1, MAX, False, R, R_keta) * (MAX+1)
                for i in range(MAX+1, 10):
                    ret += f(n+1, i, False, R, R_keta)
            
            memo[(n,MAX,giri)] = ret
            return ret

        ans = f(0,0,True,R,R_keta) 
        memo = defaultdict(int)
        ans -= f(0,0,True,L,L_keta)
        print(ans)

main()