toplevel "A";
"A" or "B" "C";
"B" wsp "K" "J" "I";
"C" wsp "L" "J" "I";
"I" lambda=0.5 dorm=0.5;
"J" lambda=1 dorm=0.5;
"K" lambda=0.5 dorm=0.5;
"L" lambda=0.5 dorm=0.5;