What are the odds the New England Patriots go undefeated this season?

the pats do have a great team. but going undefeated in the nfl now a days is almost impossible. beating 2 teams twice in the same year is hard enough and they have to play 3 teams twice. i think they'll lose there first game in week 2 against the chargers. if not then then week 9 at indy. they will lose at least 1 of those games if not both. i see the pats being a 13-3 or 12-4 team winning the afc east and going to the super bowl.