Osman Sow netted twice as Hearts scored five on home soil for the second successive match to see off Livingston.The Jambos, who remain top of the Scottish Premiership after this 5-0 thumping, took just 14 minutes to get up and running with Soufian El Hassnaoui breaking the deadlock.On the half hour mark it was two. Having watched Alim Ozturk rattle the post just a minute earlier Jamie Walker found a way past Darren Jamieson from a tight angle.Sow then profited from a stray back pass to fire home his first of the afternoon two minutes before the break and sights were set on repeating last Saturday's 5-1 win over Cowdenbeath.Livingston had no answer to Hearts' relentless attacks and were lucky not to be four down in the 68th minute when Morgaro Gomis hit the crossbar.Substitute Jamie Keatings did do just that when he grabbed his first Tynecastle goal just 12 minutes after coming on before Sow put the icing on the cake with a fantastic first-time finish.