Wow, I have a lot of questions this week! Anyway, this is one on drawing resonance structures. I've gotta draw three valid resonance structures for fulminic acid. So far I have only:

 H-N=C=O

 H-O-C(triple bond)N

I'm not sure that those 2 are valid. Can someone check if for me please? That would be awesome! Also, I'm having trouble on drawing the third structure...