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There is no way, (this being written on 23rd may 2012) to craft for free. It is just classic you get for free which is placing blocks. You would need to purchase Minecraft to be able to craft.
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Free
You cant...you have to craft them from planks.
You can play the demo or you can go onto a site (not reccomended) and download it there for free.
its the same with the paid Mine craft
there is no code for that
the free code is 89079
Templates for a star outline can be bought at craft shops. There are also lots of craft web sites with free patterns and ideas for projects using them.
You don't get a free group code for edmodo, the free group code for edmodo gets you...
There is no code for free microsoft points. same answer
Google for Mineshafter. That is a free alternative to official minecraft services.