c is not constant.Well, everyone, I am going to be out of country for the next week or so and probably out of communication with topix. I hope everyone enjoys discussing whether c is constant!
Sometimes it takes on the ssss sound and sometimes the k sound. Sometimes it's used a number and sometimes a musical note. I hear it's also used as a static variable in mathematical equations.
So, not only is c not constant, it's quite versatile.