import pypyjit
pypyjit.set_param("max_unroll_recursion=-1")

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

        print(f(0,0,True,R,R_keta) - g(0,0,True,L,L_keta))

main()