1.1 start/end

1.2 system judge

1.3 flow division

1.4 file

1.5 user command

1.6 tickling

1.7 system work

1.8 footnote

1.9 area

1.10 conditional area

2.1 normal line

2.2 conditional line

2.3 one way line

3.1 decision point

3.2 concurrent set

3.3 conditional branch

3.4 conditional selector

3.5 cluster