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(While you can prepare your tree directly in your tree-testing tool, we’ve found that this is usually slower and fussier than working in a dedicated document app first.)

Using a text file

Some people use plain ASCII text files (e.g. tree1.txt), while others use a word processor (e.g. tree1.doc). Each heading is a separate line of text, and its level in the tree is shown by indenting with spaces or (even better) tabs:

Using a spreadsheet

While either of these will work, we recommend using a spreadsheet instead, because:

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