{TAIL ~ A security test scheme} is developed to have {HEAD ~ a set} of test requirements whose satisfaction by the merchant entity is sufficient to ensure compliance with the sets of security requirements defined by the payment processing organizations 
{ TAIL ~ A security test scheme } is developed to have { HEAD ~ a set } of test requirements whose satisfaction by the merchant entity is sufficient to ensure compliance with the sets of security requirements defined by the payment processing organizations
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH