wrongrook wrote: ↑Mon Apr 27, 2020 8:11 pm

Packaging 2 and 4 are built up in different ways.

2 comes from:

A) place bag 1 inside

B) place bag 2 inside

C) place 1 and 2 in bag 3

D) place bag 4 inside

4 comes from:

A) place bag 1 inside

B) place bag 2 inside

C) place bag 3 inside

D) place bag 1 and 2 in bag 4

In other words, you are right that you are not allowed to swap the empty bag.

I'm not quite sure I understand what you mean. Even so, how does taking this packaging differance into a account change anything? If i do what you did for the rest I get the following:

1. Four empty bags,

1 comes from:

A) Place all bags inside

2. 1 and 2 inside 3, 4 empty,

2 comes from:

A) place bag 1 inside

B) place bag 2 inside

C) place 1 and 2 in bag 3

D) place bag 4 inside

3. 1 and 3 inside 4, 2 empty,

3 then comes from:

A) place bag 1 inside

B) place bag 3 inside

C) place bag 1 and 3 in bag 4

D) place bag 2 inside

4. 1 and 2 inside 4, 3 empty,

4 comes from:

A) place bag 1 inside

B) place bag 2 inside

C) place bag 3 inside

D) place bag 1 and 2 in bag 4

5. 2 and 3 inside 4, 1 empty,

5 then comes from:

A) place bag 2 inside

B) place bag 3 inside

C) place bag 2 and 3 in bag 4

D) place bag 1 inside

6. 1 and 3 inside 2, 4 empty,

6 then comes from:

A) place bag 1 inside

B) place bag 3 inside

C) place bag 4 inside

D) place bag 1 and 3 in bag 2

7. 2 and 3 inside 1, 4 empty,

7 then comes from:

A) place bag 2 inside

B) place bag 3 inside

C) place bag 1 inside

D) place bag 2 and 3 in bag 1