Original sentence: A key distinction from Lisp (and other functional languages) is that Backus' language has the following hierarchy of types:.When Backus studied and publicized his function-level style of programming, almost thirty years ago, his message was mostly misunderstood, giving boost to the traditional functional programming style languages (such as Lisp) instead of his own FP and its successor FL
Edited sentence: A key distinction from functional languages is that Backus' language has the following hierarchy of types:.When Backus studied and publicized his function-level style of programming, almost thirty years ago, his message was mostly misunderstood, giving boost to the traditional functional programming style languages instead of his own FP and its successor FL