The consonant q used alone means four root letters.
Letter q -and no letter f- is used because it is the first letter of the Latin quattuor, the word used to say number four, 4.
In some other languages number four, 4, has q for the first letter of the word that means four: in French, quatre; Italian, quattro...
In its present state, Oham offers nothing concerning the patterns q. Maybe in some future patterns q will also be studied and treated. For the moment Oham does not take these patterns q into account.