================================================================================
Basic push and pop
------------------------------
$$CodeStackLevel{}
$$PushCodeStack{}
$$CodeStackLevel{}
$$PushCodeStack{}
$$CodeStackLevel{}
$$PopCodeStack{}
$$CodeStackLevel{}
$$PopCodeStack{}
$$CodeStackLevel{}
$$PopCodeStack{}
$$CodeStackLevel{}
------------------------------
0

1

2



1



0

0
------------------------------
================================================================================
PopCodeStack{level}
------------------------------
$$PushCodeStack{}
$$PushCodeStack{}
$$PushCodeStack{}
$$PopCodeStack{1}
$$CodeStackLevel{}
$$PopCodeStack{4}
$$CodeStackLevel{}
$$PopCodeStack{0}
$$CodeStackLevel{}
------------------------------








1

1



0
------------------------------
================================================================================
SetCodeStack
------------------------------
$$a1 = {{
$$SetCodeStack{{1 | Close A1}}
Open A1
}}
$$a2 = {{
$$SetCodeStack{{2 | Close A2}}
Open A2
}}
$$a3 = {{
$$SetCodeStack{{3 | Close A3}}
Open A3
}}
$$a4 = {{
$$SetCodeStack{{4 | Close A4}}
Open A4
}}
$$a3{}
$$a4{}
$$a1{}
------------------------------





Open A3

Open A4

Close A4

Close A3





Open A1
Close A1

------------------------------
================================================================================