<p>The number at the left-hand margin is the depth of the *include nesting. The indented number to the left of the *begin or *end line shows the depth of the begin/end survex block nesting. *title lines are indnted further to make them more easily visible.
<p>An extra line *edulcni is inserted to show where an included file ends. The *include and *edulcni lines omit the ".svx" from the end of the filename.
<p>The survex files which are NOT part of the main include tree have been collected together and included under a constructed file "_unseens" following the line "0 *include _unseens" into a begin/end block labelled "troggle_unseens".