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According to the table in the getting started section, we can see that the difference between each way of obtaining £5 is 3 deposits and 2 withdraws, e.g. 4 deposits and 1 withdraw corresponding to 7 deposits and 3 withdraws. Since the 3 deposits is canceled by the 2 withdraws, it allows a change in the equation while maintaining the outcome. Therefore, we can draw a conclusion that there are infinite ways of increasing £5 in Alison's account by repeating the pattern of 3 deposits and 2 withdraws.
In fact, since the 3 deposits and 2 withdraws makes 0, we can make infinite changes to Alison's bank account simply by adding 3 deposits and 2 withdraws to an equation, causing a change in the equation itself but not the outcome. Therefore, there are infinite other ways which can change an infinite amount of numbers in Alison's bank.