Most often the /r/ sound in the initial, final, and medial positions is made by the consonant r as in the words rat, ring, rocket, jar, and erase. The use of the consonant r is very consistent for the /r/ sound, although there are other letters and combinations of letters that also make the /r/ sound. The most common is wr in the words write and wrist. Other less common combinations include rhy in rhyme, rps in corps, rt in mortgage, and l in colonel. Sometimes the consonant r is silent, as when it is doubled in words like arrest.