Explain 'Sequential Code' and 'Mnemonic Code' with the help of an example.

Sequential codes: Numbers and /or letters are assigned in consecutive order. These codes are applied primarily to source documents such as cheque, invoices etc. This code can facilitate searches. This process enables in either identification of missing codes relating to a particular document or a relevant document can be traced on the basis of code. For example: A creditor Rajesh Gupta can be given a code CL001-Rajesh Gupta Similarly for Bajaj and Sons $\displaystyle 22$ CL002- Bajaj and Sons Mnemonic Code: A mnemonic code consists of abbreviations as symbols to codify a piece of information like ‘PJ’ can be used for Purchase Journal, DDN for Dehradun. These codes can be remembered easily and aids its users in recalling the information it represents. For Example: Entering SUB may initiate computer to subtract