I just found out about a little math game called Four Fours. Basically what you try to do is try to represent integers using only the number 4 and a few common mathematical operators, for example:
0 = 4 – 4 + 4 – 4
1 = ( 4 + 4 ) / ( 4 + 4 )
2 = ( 4 * 4 ) / ( 4 + 4 )
…
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