The Election Commission issued a Standard Operating Procedure, SOP on Tuesday for Electronic Voting Machines EVMs burnt memory checking and verification with expanded choices for candidates. The SOP includes the selection of EVMs from any polling station in an assembly constituency and the mix and match of EVM units from any polling station connecting Ballot Unit, Control Unit and VVPAT in any sequence. It also has also the option of casting up to 1400 votes in a mock poll in any sequence. The Poll Body said that any fear of hidden functionality in the firmware or bias is eliminated through the randomness and enormity of test vectors in this checking and verification process. The vast and varied choices solely decided by the candidates ensure the creation of a very large number of inputs to the EVMs by way of a combination of the number of key presses and the sequence in which the keys are pressed, for a thorough verification.