Information following questions ask you to write CFGs. An example illustrates the encoding you have to use for submission. Assume your CFG has the productions s-aTbA ACT A -alAT|e Flag question Then you'd submit the following: A-aIATI You can use any single capital letter as a non-terminal: s is the start symbol. Any lower-case letter and any digit is a terminal. An underscode denotes the empty sting e. There mustbe exacty one line for each non-terminal. A bar 1 is used to separate the choices on the right-hand side Right-hand sides must not be empty, at least one option must be given. Each choice in a right-hand side must not be empty it may be for e. Productions must not contain spacing, In summary every production must contom to the folowing Python regular expression: Please use the Precheck button to partialily check the syntax of your CFG representation before submitting i to a question using the Check button. A precheck attracts no marks and no penality you can use it any number of times and also after incorrect submissions. if your representation fails the precheck, it wil fail the full check as well If ft passes the precheck, it may or may not pass the fuil check