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How to create a file of problems

1 Open the notepad.

2 Write the words to highlight.

3 Write the sentence of problem.

4 Write the sentence of answer.

5 Write an empty row.

6 Repeat the 2-5.

7 save the file in UTF-8.(For download version, not UTF-8 but 1-2byte character set.)

About the word to highlight.
If there is @ in front of the word , the word will not be visible.

About the sentence of problem and the sentence of answer.
It need . at the end of sentence.