Chain Addition is akin to a Linear-feedback shift register, whereby a stream of number is generated as an output (and fed back in as an input) to a seed number. Within the VIC Cipher chain addition works by (1) taking the original (seed) number, (2) false-adding the first two digits, (3) putting this new number at the end of the chain. This continues, however the digits being added are incremented by one. For example, if the seed was '90210', the first 5 iterations are shown below: