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This puzzle can be solved using the following concepts. Practice using these concepts and improve your skills.

Statement

 Goal

A directed acyclic word graph (DAWG) is a data structure that represents a set of strings, often used as a compact way to store a dictionary. Each word starts from the source node and ends at the sink node. In between the source and sink is a network of nodes, connected by directed edges labeled either with a letter or as EOW (end-of-word) when connecting to the sink. Each node has at most one outgoing edge for each letter or EOW. Following every possible path from the source node to the sink node gives you the list of words in the dictionary.

Given a set of strings, determine the minimum number of nodes needed to store them in a DAWG.

A graph for the example can be found here: https://en.wikipedia.org/wiki/Deterministic_acyclic_finite_state_automaton
Input
Line 1: The number of words N
Next N lines: The word list
Output
The number of nodes needed
Constraints
N ≤ 1300
Example
Input
4
tap
taps
top
tops
Output
6

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