Not only can you use them once each (because otherwise it's idiotic), but they need to be used in order as well. Otherwise I could've just done 5*4+7+7.
34 is trivial to obtain if you can figure out how to do any of the following:
-Eliminate the 5, the way I eliminated the 4 in obtaining 19, and eliminated a 7 and the 4 in obtaining 35 (see the original post)
-Turn the two 7s into a 2 or 5
-Turn the 5 and first 7 into a 3 or a 6
-Turn the second 7 and the 4 into a 0 or 1



), but they need to be used in order as well. Otherwise I could've just done 5*4+7+7.
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