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You may want to extend the types later. For example, now you need ten types
of obstacles and ive types of runway terrains. Imagine you just increase the ile
ID every ime you introduce a new ile. This way, you will end up messing up the
integers' sequence, as shown in the following figure:
We use a single digit for normal iles and the obstacle starts at 100. It is logical to think that
101, 102, and so on, will be another type for an obstacle. The new map will be similar to the
following figure:
