Some three letter words that have an A in the middle are:
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Some 3 letter words with the letter "r" in the middle are: are, bra, bro, arm, url, and ere.
eke. ski. sky.
den hen ten let bet net her
Some six letter words with FF in the middle are:wafflebafflebufferduffermufflepifflesufferduffelpuffindiffer
awe owe ewe owl own awl two