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In addition to the above reply, remember that a single unpaired electron (found in radicals) counts as a single region of electron density (basically a single unpaired electron is treated as if it were a normal lone pair).
After you draw the lewis structure you can count the number of regions with high electron density which are the bonding pairs and unshared electron pairs around the central atom. Double and triple bonds count as one region of electron density.
The first step is to draw the lewis structure. Electron densities include areas where you are most likely to find electrons. This includes all lone pairs and bonding regions. It's important to note that a double or triple bond would still count as one electron density.
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