A. Make sure the game is worth the candle.
B. That is a step in the right direction， but I don't believe it is enough.
C. You take the easy obstacles first and by a process of elimination you eventually arrive at the one or two major ones.
D. But in selecting the problem， you need to be sure to analyze it carefully to see that it is worth the effort.
E. Research isn't a physical thing at all； it's a state of mind.
F. By contrast， all research work is 99. 9 per cent failure and， if we succeed once， we are in.
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