The only thing that matters for what lines are grouped together in one if are the {}s. Anything between them gets grouped together and all spaces and blank lines can be as many or few as you feel like putting in. The standard coding type is each block is tabbed over once more than the block its inside of like sontonin did. This way you can easily see what is in each if and each event also. But its only for readablities sake, the computer takes all the extra spaces and line returns out before it does anything with it.
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