how to tell the sex of flies

Red hunter

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Fred has been swatting at flies and his wife getting a little annoyed with the comotion asks if he has killed any. He tells her that he has killed 5 total 2 males and 3 females. How do you know what sex they were? she asks. 3 were on the phone and 2 were on a beer can. Fred was the next to get swatted at.
 
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