David Coleman reports on today's F.A. Cup Fourth RoundThirty-two clubs compete in today's round of the F.A. Challenge Cup competition. Already five First Division clubs have been eliminated-Ipswich Town, Leeds United, Nottingham Forest, Queen's Park Rangers, and Sunderland. Which First Division giants will today join them? It could be the holders themselves, West Bromwich Albion, who are away to Fulham, surprise team of the Third Round; or Manchester United, who meet Third Division success side Watford; or even Arsenal, who clash with London rivals Charlton. As always, shocks are guaranteed.David Coleman, Alan Weeks, and Kenneth Wolstenholme report with outside broadcast cameras on three of today's exciting Cup Ties.Liverpool v BurnleyFulham v West Bromwich AlbionPreston North End v Chelsea