toplevel "A";
"A" and "B" "F";
"B" 2of3 "C" "D" "E";
"C" lambda=0.1 dorm=0;
"D" lambda=0.2 dorm=0;
"E" lambda=0.3 dorm=0;
"F" 2of3 "G" "H" "C";
"G" lambda=0.4 dorm=0;
"H" lambda=0.5 dorm=0;