At: assignment monotone 1 1 3 1 1
1. f: Formula
2. x1: Formula
3. x2: Formula
4. a: Assignment
5. a': Assignment
6. a' extends a
7. a |= x1 
a' |= x1
8. a |
x1 
a' |
x1
9. a |= x2 
a' |= x2
10. a |
x2 
a' |
x2
(a |= x1

x2 
a' |= x1

x2 ) & (a |
x1

x2 
a' |
x1

x2)
By:
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THEN
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Generated subgoals:| 1 | 11. a |= x1  x2 a' |= x1  x2 |
| 2 | 11. a | x1  x2 a' | x1  x2 |
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