they used Vanitygen to create the adress Vanitygen just randomly generates a private key, checks if it matches the pattern and keep it if it does. If not the key is not stored. Considering 1 million addresses per second and ideal storage (32 byte per priv. key, no overhead) you have to store 2764800000000 byte or 2.5 TiB per day. Thus you cant check for doubles. Even if you could, knowing the result of one round does not bring you a step closer to the solution. To make sure you have all solutions you have to try all combinations. For bitcoin those are 2256 private keys for 2160 possible addresses.
look for a collision in BTC adress is like as for a blow job to your wife, in all the existence of the universe THIS WILL NEVER HAPPEND
EN: i would like to reming you that this is the italian subforum so please try to post at least a dirty translation of what you say or hostfat would maybe delete it or edit to make the translation heself
IT: Vorrei ricordarti che stai nella sezione italiana quindi gentilmente prova a postare almeno una traduzione grezza di quello che stai dicendo o hostfat potrebbe eliminare i post o modificarli facendo lui la traduzione