set G = make lcg with 4,56,7,12. 
set G2 = make lcg with 4,56,7,-12. 
set G3 = make lcg with 14,56,-27,120. 
set G4 = make lcg with 14,56,-27,-120. 

set G5 = make iomaps with G,G2,G3,G4. 
set V = run G5 with file dummy_file.txt.
