1. While trading equities, what do RL, SL, ST, NT, OL, AU and ALBM mean? 2. What does the vadility type of EOSESS, EOTODY and EOSTLM mean? In the same category, DAY, GTD(DAYS), GTD(dd/mm), GTC and IOC mean? 3. What does squaring off mean? 4. What is the difference between variable margin and exposure margin? 5. What does MTMP and MTML mean? 6. What is the difference between first-leg and second-leg trading?