Range from columns based on list of values

Hi,
I have a table that has a key_code and a alt_code like this
with values like so.. (has 2 million records in 8.1.7 Database)
KEY_CODE ALT_CODE
0001     AA
0001          AB
0001          AF
0001          G4
0001          G5
0001          G6
0200          BB
0200 BC
0200 BD
0200 Bx
I'm struggling with the concept of how to create a range of these values.
There is one problem I'm running into.
The alt code must be in a valid code list to have a break in the range
An example would be
VALID ALT_CODES TABLE
B1
B2
ZA
ZB
ZC
ZH
ZJ
ZK
WHAT I'M LOOKING FOR IS THE OUTPUT TO BE
KEY_CODE          BEGRANGE               ENDRANGE
10               B1                    B2
10               ZA                    ZK
20               ZA                    ZJ
WHAT I'VE GOT SO FAR IS
SOMETHING THAT LOOKS LIKE
THE PROBLEM IS THAT THE VALID ALT_CODE LIST IS NOT SEQUENTIAL AND THERE ARE GAPS.
SO IF, FOR EXAMPLE THERE IS NO CODE ZD IT WILL BREAK A RANGE ON IT THE VALUE BETWEEN ZC AND ZH
WHEN I DON'T WANT IT TO.
KEY_CODE          BEGRANGE               ENDRANGE
10               B1                    B2
10               ZA                    ZC
10               ZH                    ZH
10               ZJ                    ZK
20               ZA                    ZC
20               ZH                    ZH
20               ZJ                    ZJ
I'd be most grateful for your input.

Ditto.
And where the hell does this row come from (not to mention the 10s and 20s being totally different key codes from the first table)?
KEY_CODE BEGRANGE ENDRANGE
10 B1 B2
10 ZA ZK
20 ZA ZJ <-- ??

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