/* PW petri format */
/*  start   acad    attrib  radiance simulation viewer end */
/*    1      2        3         5        6        4     7
/*  transition, transition (comment) */
petri(1, 2).   /* autocad */
petri(2, 3).   /* attribution */
petri(3, 2).   /* cad after attribution */
petri(3, 4).   /* viewer after attribution */
petri(3, 5).   /* radiance after attribution */
petri(3, 6).   /* simulation */
petri(6, 2).   /* cad after simulation */
petri(6, 3).   /* attribution after simulation */
petri(5, 6).   /* simulation after radiance */
petri(5, 4).   /* viewer after radiance */
petri(6, 7).   /* end after simulation */
petri(5, 7).   /* end after radiance */
