72.
Pronounced as one letter, and written with three,
Two letters there are, and two only in me;
I’m double, I’m single, I’m black, blue, and gray,
I am read from both ends, and the same either way,
I am restless and wandering, steady and fixed,
And you know not one hour what I may be the next.
I melt, and I kindle—beseech, and defy,
I am watery and moist, I am fiery and dry.