My first solution at: https://dmcommunity.org/challenge/
...but tables 1 and 2 are even more simplified.


Table 0: Taxform
If:                                                    | 0| 1| 2| 3| 4| 5| 6| 7| 8| 
'Doccode being processed is 7,8 or 28'                 | Y| Y| Y| Y| Y| Y| Y| Y| N|  
Taxable_income < 50000                                 | Y| Y| Y| Y| Y| Y| Y| N| -| 
Interest_income < 400                                  | Y| Y| Y| Y| N| -| -| -| -|
Taxable_pension = 0                                    | Y| Y| Y| N| -| -| -| -| -|
Age < 65                                               | Y| Y| Y| Y| Y| N| N| -| -| 
Agi < 25000                                            | -| -| -| -| -| Y| N| -| -|
Doc_code = 28                                          | Y| N| N| -| -| -| -| -| -|
'Zipcode ok (not APO, SC or LL)'                       | -| Y| N| -| -| -| -| -| -|
Then:
Formcode is MFR15                                      | X| X|  |  |  |  |  |  |  |
Formcode is MFR13                                      |  |  | X|  |  |  |  |  |  |
Formcode is MFR02                                      |  |  |  |  | X|  | X| X|  |   
Formcode is MFR14                                      |  |  |  |  |  | X|  |  |  |  
Formcode is None                                       |  |  |  | X|  |  |  |  | X|
# .......

Attribute: Taxable_income
Askable_using: "What is the Taxable_income?"
Attribute: Interest_income
Askable_using: "What is the Interest_income?"
Attribute: Taxable_pension
Askable_using: "What is the Taxable_pension?"
Attribute: Age
Askable_using: "What is the Age?"
Attribute: Agi
Askable_using: "What is the Agi?"

GoalAttribute: Formcode
Case: MFR02                    
Print: "Taxform to send is MFR02"
Case: MFR13                    
Print: "Taxform to send is MFR13"
Case: MFR14                    
Print: "Taxform to send is MFR14"
Case: MFR15                    
Print: "Taxform to send is MFR15"
Case: None                    
Print: "No Taxform to send"
# ................................................................................................

rTable 1: Doccode being processed is 7,8 or 28
If:                                                     | 0| 1| 2|
Doc_code = 7                                            | Y| N| N|
Doc_code = 8                                            | -| Y| N|
Doc_code = 28                                           | -| -| Y|
Then:
'Doccode being processed is 7,8 or 28'                  | X| X| X|

# .......
Attribute: Doc_code
Askable_using: "What is the doccode being processed (7,8 or 28 expected)?"

# ................................................................................................

rTable 2: Zipcode ok (not APO, SC or LL)
If:                                                     | 0|
Zip_code is APO                                         | N|
Zip_code is SC                                          | N|
Zip_code is LL                                          | N|
Then:
'Zipcode ok (not APO, SC or LL)'                        | X|

# .......
Attribute: Zip_code
Askable_using: "What is the zipcode?"

# ................................................................................................