1 dozen = 3 quadruple; 1 quadruple = 0.333333 dozen
million ↔ one
billion ↔ one
billion ↔ thousand
million ↔ thousand
million ↔ billion
billion ↔ trillion
trillion ↔ one
crore ↔ million
lakh ↔ million
crore ↔ billion
lakh ↔ billion
crore ↔ one
lakh ↔ one