Is a group of letters a sentence?
I am wondering if a group of a bunch of letters, Is a Sentence?
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A random group of letters might spell a sentence, just as a random group of bricks might constitute a house; but both are very unlikely.
What exactly a "sentence" is is controversial and will depend largely on the prejudices of the person talking about it; but I don't think anybody would consider a sentence to be composed either of letters or of the sounds which the letters represent. For most people who use the term a sentence is composed of what we may for simplicity's sake call "words"; those words must be meaningful in a particular language, they must be ordered according to the morphological and syntactical rules of that language, and their ordering must exhibit a particular structure, complexity and coherent meaning demanded by the currently operative definition of "sentence".
In practice, a "sentence" is any portion of a written utterance which lies between two stops. The term is of very little use for anything except passing examinations by conforming your writing to your teacher's understanding of what a sentence is.