 Were the system implemented, palindromic PINs such as 5555 or 2112 then would be unavailable so that false alarms would not occur.Moreover, PINs that are semi-reversible such as 5255 or 1241, where the first and last numbers are the same, would be something to avoid as well so that accidental alarms would not be triggered by mistakenly switching the middle numbers.Diebold, a manufacturer of ATMs, states on their website that no such emergency alerting system is currently in use.