Paterson (poem) caught Williams' attention for its use, with a technical skill that seemed to rival Pound's in "The Cantos", of such diverse and seemingly prosaic materials as notes from a congressional investigation, an X-ray report and a physician's testimony on cross-examination. He wrote to fellow poet Louis Zukofsky, "I've begun to think about poetic form again. So much has to be thought out and written out there before we can have any solid criticism and consequently well-grounded work here." In 1944, Williams read a poem by Byron Vazakas in "Partisan Review" that would help lead him to solutions in form and
LL parser all context-free languages. The LL(1) languages are a proper subset of the LR(1) languages which in turn are a proper subset of all context-free languages. In order for a CFG to be an LL(1) grammar, certain conflicts must not arise, which we describe in this section. Let A be a non-terminal. FIRST(A) is (defined to be) the set of terminals that can appear in the first position of any string derived from A. FOLLOW(A) is the union over FIRST(B) where B is any non-terminal that immediately follows A in the right hand side of a production rule. There are 2