One Line, One Sequence

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You can put the individual sequences in one file, and one line is one sequence. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed. However, you do not need to think what is a carriage return or line feed if you are not a programmer. I will give an example here. It will show you what is a line.

Open a text file using the Notepad in Microsoft Windows. Choose the menu of Format, and make sure the menu item of "Word Wrap" is unselected. Then you will see some lines are too long to read all of contents. That is the line.

TAAAAAAAAAAAAAAAA

GAAAAAAAAAAAAAAAA

GTAAAAAAAAAAAAAAA