arduino UNO A/D how to use A0 to A5 for ladder net w/o mux

arduino UNO A/D
I am trying to how to measure the voltages of a 6 series resistors in a ladder network, using the Arduino UNO A/D INTERNAL multiplexer by activating A0 to A5 sequentially.

I have found a lot of examples using 6 mechanical switches to connect the resistors individually to the terminals A0 to A5.

As a newbie I am having trouble making these connections in by using software ONLY, without
EXTERNAL electronics ( including an EXTERNAL multiplexer or mechanical switches).

QUESTION: (1) Is it possible to use a for() loop to connect the 6 resistor ladder network
to the A/D in a sequential manner ?
(2) Please give me an example of how this can be accomplished.

I have tried to do that but I my attempts to use a for() loop indexing the terminals
A0 to A5 as Ai have failed!

something like this you mean?

//polls A0-A5 every 1s and prints output to serial monitor

const uint8_t Ain_size = 6;
uint8_t Ain[Ain_size] = {A0, A1, A2, A3, A4, A5};

void setup() {
  // put your setup code here, to run once:

void loop() {
  // put your main code here, to run repeatedly:

  for (uint8_t i = 0; i < Ain_size; ++i) {
    Serial.print("input ");
    Serial.print(": ");
    Serial.print(", ");