def main():
    S = input()
    T = input()
    n = len(S)
    X0 = [0] * 26
    X1 = [0] * 26
    Y0 = [0] * 26
    Y1 = [0] * 26
    for i in range(n):
        if not i % 2:
            X0[ord(S[i])-97] += 1
            Y0[ord(T[i])-97] += 1
        else:
            X1[ord(S[i])-97] += 1
            Y1[ord(T[i])-97] += 1
    if X0 != Y0 or X1 != Y1:
        return "No"
    f0 = f1 = 0
    for i in range(26):
        if X0[i] > 1:
            f0 = 1
        if X1[i] > 1:
            f1 = 1
    if f0 or f1:
        return "Yes"
    Z0 = [0] * 26
    Z1 = [0] * 26
    c = 0
    for i in range(0, n, 2):
        a = ord(S[i])-97
        for b in range(a, 26):
            c ^= Z0[b]
        Z0[a] = 1
    for i in range(1, n, 2):
        a = ord(S[i])-97
        for b in range(a, 26):
            c ^= Z1[b]
        Z1[a] = 1
    
    return "Yes" if not c else "No"

for _ in range(int(input())):
    print(main())