[HH] is illegal, but this softerware does't throw any exception.

[goldwind-ting]

    @Test
    public void two_adjacent_h() throws IOException {
        Graph g = Parser.strict("[HH]");
    }

The test runs successfully, but [HH] is illegal!

[johnmay]

Illegal according to who?

[goldwind-ting]

Illegal according to who?

A post referred in the repo. See OpenSMILES.

[johnmay]

I helped write the OpenSMILES spec and it’s more important for writing than reading. Beam accepts [HH] as input but will not emit it as output. Think about it like this, if no toolkit can read them how can you fix them.