In the following test there are a number of short sentences each followed by a pair of letters ('AB' or 'BA'). The sentences claim to describe the order of the pair of letters; for example, to say which comes first.

For example, the letters 'AB' can be described in a number of ways:

1. A precedes B, or
2. B follows A, or
3. B does not precede A.

   You must read each sentence and respond by clicking on the left or right arrow to indicate whether you believe the sentences to be correct. To gain maximum points you must work as quickly as possible without making mistakes.