text: Better FEC codes typically examine the last several dozen , or even the last several hundred , previously received bits to determine how to decode the current small handful of bits ( typically in groups of 2 to 8 bits ) .
simplified: In practice , FEC codes typically examine the last several dozen , or even the last several hundred , previously received bits to determine how to decode the current small handful of bits ( typically in groups of 2 to 8 bits ) .