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 = 0n1 = 0n2 = 0n3 = 0n4 = 0while 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]}	"    else:        output += f"{a0[n0]}"    if a1[n1]:        output += f"{a1[n1]}	"    else:        output += f"{a1[n1]}"    if a2[n2]:        output += f"{a2[n2]}	"    else:        output += f"{a2[n2]}"    if a3[n3]:        output += f"{a3[n3]}	"    else:        output += f"{a3[n3]}"    if a4[n4]:        output += f"{a4[n4]}"    print(output)