toplevel "A";
"A" or "B" "C";
"B" and "D" "L";
"C" and "M" "N";
"D" and "I" "J" "K";
"DEP1" fdep "T" "I" "J" "K";
"DEP2" fdep "D" "L";

"I" lambda=0.5 dorm=0;
"J" lambda=0.5 dorm=0.5;
"K" lambda=0.5 dorm=0.5;
"L" lambda=0.5 dorm=0.5;
"M" lambda=0.5 dorm=0.5;
"N" lambda=0.5 dorm=0.5;
"T" lambda=0.5 dorm=0.5;