This page describes the output format that STP uses when passed the `--output-cnf` option. For example:

```
c Result of efficient AIG-to-CNF conversion using package CNF
p cnf 7 8
2 3 -4 6 0
2 4 -5 6 0
2 -4 5 6 0
-2 -6 0
-2 4 5 0
-2 -3 -4 -5 0
7 0
2 0
```

Lines beginning with `c` are comment lines, which are disregarded.

The line beginning with `p` is the problem line, which is of the format `p cnf nvars nclauses` where *nvars* and *nclauses* are the number of variables and clauses, respectively.

Each other line encodes one clause. Clauses are defined as a list of literals followed by a `0`. Positive literals are 1, 2, ..., and negative literals are -1, -2, ....

The code that generates the output file is in extlib-abc/aig/cnf/cnfMan.c.