is signalled by the umpire in the same way as travelling is signalled in basketball. There is no limit to how many bounces or ground touches a player can do, nor a limit to how long a player can hold the ball. When a player is in possession of the ball, and is tackled correctly (i.e., held, not just touched, above the knees and below the shoulders), he or she must immediately attempt dispose of the ball by kicking or hand-passing. If the player is considered by the umpire as having had a prior opportunity to dispose of the ball (such as if the player has run, dodged or fended off an opponent) then a failure to successfully kick or handball results in a holding the ball penalty benefiting the tackling team, which is awarded a free kick. This includes if the ball is knocked free, a kick or handball is attempted but missed, or if the ball is trapped by the tackler. If there was no prior opportunity for the player to dispose of the ball before being tackled, then a free kick is only paid if player with the ball is able to, but does not attempt to dispose of it within a reasonable time. This is also called holding the ball. No free kick is paid if a player without a prior opportunity is tackled, but the ball is unable to be released due to it being held to or under the player by the tackler. A ball-up would result to restart play. If a tackle on a player with no prior opportunity causes the ball to spill free, then "play on" is called and the game continues. In a recent effort to reduce the amount of unnecessary stoppages, the interpretation of the prior opportunity has widened to include any player who grabs hold of the ball during a ball-up or throw-in situation instead of knocking it away. In this instance, if the player is then tackled and could not dispose of the ball legally, a holding the ball penalty would be paid against him. Scoring Like many other codes of football, the primary way to score points is to score goals. In Australian football, there are two types of scores: a goal and a behind. There are four posts at each end of the ground, each 6.4m (7yds) apart; the two middle (and taller) posts are