title: how do you create a context free grammar for this language and pda?
body: <p>Show that a set L containing equal number of 01s and 10s is regular ; 
  [hint: L = {‘’, 0,00..,1,11…,010,101,…}, consider two branches; one starting with 0 and other with 1.]
  Write a CFG and PDA for L.</p>