$ cd my_data/
$ ls
1.english.txt  upwords.10
$ grep '\(.*q\)\{2\}' 1.english.txt 
equivoque
equivoques
quinquennia
quinquennial
quinquennially
quinquennials
quinquennium
quinquenniums
$ grep '\(.*q\)\{2\}' upwords.10 
eqivoqe
eqivoqes
qinqennia
qinqennial
qinqennium
$