derivation checker to accept and generate ε not "", some file path
changes in Writer, toStringPython() without linebreaks

epsilon-Rules

grammars

optimized createCNF() and cyk() in Type2Parser

removeNonCoReachableVariables to LinkedHashMap

deleted unnecessary variables in Derivation, updated T3P and auxiliary
classes to more closely resemble original algorithm, usage of
LinkedHashMap in T2P, fixed bug in Type 2 Word generator

check

writer, fixed word generator bug