law: Negotiable Instruments Act, 1881 
  132. Set of bills 
  Bills of exchange may be drawn in parts, each part being
  
  numbered and containing a provision that it shall continue payable only so long
  
  as the others remain unpaid. All the parts together make a set; but the whole
  
  set constitutes only one bill, and is extinguished when one of the parts of a
  
  separates bill, would be extinguished.
  Exception:  When a person accepts or endorses different
  
  parts of the bill in favor of different person, he and the subsequent endorsers
  
  of each part are liable on such part as if it were a separate bill.