Conceptually, an interior node is an array of n pointers and n - 1 key values. A pointer is between the two key values that bound the entries that it covers; we imagine that the array is bounded by key values of - &infin and &infin. (In practice, two arrays, pointers and key values, may be used since they are of different types.)

Binary search of the array of key values can be used to find the right pointer to follow. If we have the sequence
         key_i pointer_i key_i+1
pointer_i covers all keys such that key_i &le key < key_i+1.

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