<command> ::= python3 gengen.py (<output_spec>? <expression>+) | (<expression>+ <output_spec>?)  
<output_spec> ::= -o <filename>  
<filename> ::= \w+.py  
<expression> ::= <state_flag> <label> <dest>+  
<state_flag> ::= -n | -s | -a | -sa  
<label> ::= \d+  
<dest> ::= <label> <output_string>  
<output_string> ::= \w+  
EX: python3 gengen.py -o foo.py -sa 0 0 a 1 b -n 1 0 b  
(\w and \d as in Perl regex character classes)

state flags:
	-n : "normal" state -- neither accepting nor starting  
    	-s : "starting" state -- indicates the output script will start in this state  
    	-a : "accepting" state -- indicates the output script can stop building a string in this state  
    	-sa : "starting/accepting" state -- indicates output script will start in this state and can stop a string in this state  
	N.B.: There should only be one -s/-sa state in any specification (you can only have one state to start in)  
dest: indicates possible transition from specified state to destination state, printing specified output string
output: by default, gengen prints to default.py. The user can specify a different name for the output file with an optional output spec.
EX: python3 gengen.py -o foo.py -sa 0 0 a 1 b -n 1 0 b
	Prints a language to foo.py, which has:  
	starting/accepting state 0, with transitions to itself print 'a' or to state 1 printing 'b'; AND  
	a normal state 1 transitioning to 0 printing b  
	The generated regular language will print any number of 'a's and an even number of 'b's in pairs (i.e., 'bba', never 'bab')

<command> ::= python3 <filename> <unary_flag>*  
<filename> ::= \w+.py  
<unary_flag> ::= (-i \d+) | (-t \w+) | (-c <percentage>)
<percentage> ::= 1.00 | 0.\d+

state flags:
	-i : "iterations" -- followed by a number which indicates the number of strings to be printed
	-t : "terminal" -- sets the characters to be appended to the end of a string when it is finished
	-c : "chance" -- sets the chance (as a percentage from 0.00 to 1.00) that a string will end each time the machine enters an accepting state; the lower the chance, the longer the average string will be.
A generated script will print to stdout by default, and can be redirected from the command line
EX: python3 test.py -i 1000 -t "END" > test_out.txt