Basic component

@startboard
A1
+U1.1
++S1 R1
++S1 R2
+U1.2
A2
@endboard
@startboard
Activity 1
+User Task 1a
++Story 1 Release 1
++Story 2 Release 1
+User Task 1b
++Story 3 Release 1
+++Story 4 Release 1
++++Story 5 Release 2

Activity 2
+User Task 2
+++Story 6 Release 1
+++Story 7 Release 1
+++Story 8 Release 2
Activity 3

+User Task 3
++++Story 9 Release 2
++++Story 10 Release 3
@endboard