from functools import cache
T = int(input())

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

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

    print(f(0,0,True) - g(0,0,True))