Punctuation and comma keys do not respond

Macbook Air 11" - 2012 running Lion.
The period and the comma keys appear to be "dead" - not responding, also not when shift or other keys pressed simultaneous.
All other keys appear to function as usual.
There was no prior incident - they simply stopped working all of a sudden.
Hoping someone can help - either with an idea on how to test what the problem may be (software or hardware functionality test)
- or with a cure...
Thanks!
Per

Did you find the solution ?
I just got this same problem on 2014-12-24 with my Mac Air 2011 version
- After update to Yosemite OS - the same problem remains
- Notice that I can't do period or comma here (nor the the upper case of the same keys for "greater than" and "less than" symbols
- Could it be a hardware problem ?
- 2 things occurred at about the same period of time when the problem showed up
- (1) I was brushing my teeth with baking soda and sneezed with 2 drops of liquid on the computer (I don't think the liquid drops
were on the 2 problematic keys
- (2) while trying to get a bit torrent but was interceded by another software download recommendation which I ignored
and closed the website - computer did act strange and not sure if there was any software damage
Can "Apple Support team" reply and address this problem ?

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