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Drawing lewis structures is really just trial and error. If you draw a full lewis structure and realize you have too many electrons surrounding the elements, then a double bond has to be used. If you still have too many electrons after you have done a double bond, then a triple bond needs to be used.
Also, often you will be shifting around with the different types of bonds when drawing the various resonance structures for a compound. This usually entails removing double or triple bonds and turning them into single bonds and adding formal charges.
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