sentence1: What is the difference between NRI -LRB- Non resident Indian -RRB- & PIO -LRB- People of Indian origin -RRB- ?
sentence2: What are the legal and technical differences between a non-resident-Indian -LRB- NRI -RRB- and a person of Indian origin -LRB- PIO -RRB- and an Overseas Citizen of India -LRB- OCI -RRB- ?