* numbered as for the quadrilateral, for the back face they are just shifted.
* Finally, the four lines connecting front and back face are numbered:
* \begin{verbatim}
- * *---6---* *-------*
+ * *---6---* *---6---*
* /| | / /|
- * 11 | 5 11 10 |
+ * 11 | 5 11 10 5
* / 7 | / / |
* * | | *---2---* |
* | *---4---* | | *
* |/ / | |/
* *---0---* *---0---*
* \end{verbatim}
- * The direction of the front and back lines is as for the respective faces, while
- * the connecting faces always point to the back:
+ * The directions of the front and back lines is as for the respective faces, while
+ * the connecting lines always point to the back:
* \begin{verbatim}
* *--->---* *--->---*
* /| | / /|
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