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They do not necessarily have to lose 3 straight matches, there are 26 matches left. Dropping points at any point in the season would put pressure on then and reduce the gap. And I believe Liverpool would lose this season, but so will their opponents. If they (Liverpool) can be more consistent then they will be champions at the end of the season.
It would be quite remarkable if they top the league from the beginning to the end
There were some pretty uptight matches where Liverpool faced some difficulties so far so there I am kinda certain that they will have defeat in one or two rounds atleast but they will come at the top by the end of the season. There were matches where they were down at one half but by the end of the match they made it even or won. EPL is full of surprises so anyone can surprise them.