Troubling letters | Funny Puzzles

Look at the following two blocks of letters and find the difference between them.

• A E F H I K L M N T V W X Y Z
• B C D G J O P Q R S U

Find the difference between these letters.

 

 

(scroll down)

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(hint: look them carefully)

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the first block of letters can be write with 'lines' only and second block letters should write with 'lines and curves'. That's all!!