(Reuters) – Mohammad Rizwan scored a fluent 88 and Haris Rauf and Mohammed Nawaz took three wickets each as Pakistan edged England by three runs in a rollercoaster finish to the fourth Twenty20 in Karachi on Sunday to square the seven-match series at 2-2. In a topsy-turvy contest, Liam Dawson threatened to snatch victory from Pakistan when he took 24 runs over off Muhammad Hasnain in the 18th over, but the hosts held their nerve with a gritty bowling display at the death. Rauf (3-32) removed Dawson (34) and Olly Stone off successive deliveries in the penultimate over before Pakistan ran out Re…