如何按顺序排列组合嵌套列表中的字符串？

a0 = strlst[0]
a1 = strlst[1]
a2 = strlst[2]
a3 = strlst[3]
a4 = strlst[4]

l0 = len(a0)
l1 = len(a1)
l2 = len(a2)
l3 = len(a3)
l4 = len(a4)

n0 = 0
n1 = 0
n2 = 0
n3 = 0
n4 = 0
while True:
    # 循环变量自增
    n4 += 1

    # 处理满位进位
    if n4 >= L4:
        n4 = 0
        n3 += 1
        if n3 >= L3:
            n3 = 0
            n2 += 1
            if n2 >= L2:
                n2 = 0
                n1 += 1
                if n1 >= L1:
                    n1 = 0
                    n0 += 1
                    if n0 >= L0:
                        break

    # 输出当前排列组合
    output = ''
    if a0[n0]:
        output += f"{a0[n0]}\t"
    else:
        output += f"{a0[n0]}"
    if a1[n1]:
        output += f"{a1[n1]}\t"
    else:
        output += f"{a1[n1]}"
    if a2[n2]:
        output += f"{a2[n2]}\t"
    else:
        output += f"{a2[n2]}"
    if a3[n3]:
        output += f"{a3[n3]}\t"
    else:
        output += f"{a3[n3]}"
    if a4[n4]:
        output += f"{a4[n4]}"
    print(output)