1) added new output function calls toGraph that can be used for any rule. 2) also added codes to automatically get the user home directory and output to desktop by appending the desktop string
1) Completed implementing rule 4. 2) rule 4 can also handle subquery 3) output for rule 4 verified.
modifed graph output format. Still can't get the bowtie sign to appea.
change the bowtie sign to just using the word 'JOIN'
Merged Changes. 1) instead of using the sign, use the 'JOIN' word instead