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 separated by '+'. In a regular expression form T ('+' T)*. So the rule could be rewritten as Now there is no left recursion and no conflicts on either of the rules. However, not all CFGs have an equivalent LL(k)-grammar, e.g.: It can be shown that there does not exist any LL(k)-grammar accepting the language generated by this grammar. LL parser In computer science, an LL parser is a top-down parser for a subset of context-free languages. It parses the input from Left to right, performing Leftmost derivation of the sentence. An LL parser is called an LL("k") parser if