What is the purpose of the pencil?

Firstly you can find the pencil option in the top right corner of the puzzle screen.

The purpose of the pencil is to use whether you are unsure of a letter or word.  It will change the color of the text while you have it selected. 

It makes it easier for you to distinguish which letter or word you were having troubles with.  

Off (The color of the text is black):

some text

On (The color of the text is grey): 

some text

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