Read all words from a file and add them to a map whose keys are word lengths

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Read all words from a file and add them to a map whose keys are word lengths and whose values are comma-separated strings of words of the same length. Then print out those strings, in increasing order by the length of their entries.

Provide two versions of your solution, one that uses the merge method (see Special Topic 15.1) and one that updates the map as in Worked Example 15.1.

Data from special topic 15.1

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Data from worked example 15.1.

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