4 Icons for App screen

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Job Description

I am looking 4 graphics for my Android app to replace the four block buttons that I currently have. I am looking for something similar to what Twitter did in the attached screenshot. I need graphics to represent the following buttons:
1) Submit Word
2) Words List
3) Falshcard
4) Exit

You can take a look at my app at:
https://play.google.com/store/apps/details?id=com.zakimak.submitwords

Attached is a picture of the twitter app with similar graphics to what I am looking for you.

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