perl /Users/ncp/Documents/RegularDocuments/StandardFiles/TeXInfo/LaTeXdiff/latexdiff-so  As_used/Worksheet_20_Soln.tex  Corrected_1/Worksheet_20_Soln.tex >  Corrected_1/Diff.tex

perl /Users/ncp/Documents/RegularDocuments/StandardFiles/TeXInfo/LaTeXdiff/reverselatexdiff-so   As_used/Worksheet_20_Soln.tex  Corrected_1/Worksheet_20_Soln.tex >  Corrected_1/ReverseDiff.tex

diff  As_used/Worksheet_20_Soln.tex  Corrected_1/Worksheet_20_Soln.tex >  Corrected_1/dfile.txt