toplevel "A";
"A" or "B" "C";
"B" and "J" "K" "L";
"J" or "J1" "J2";
"K" or "K1" "K2";
"L" or "L1" "L2";
"C" or "M" "N";
"M" and "M1" "M2" "M3" "M4";
"N" and "N1" "N2" "N3" "N4";
"J1" lambda=0.5 dorm=0;
"J2" lambda=0.5 dorm=0;
"K1" lambda=0.5 dorm=0;
"K2" lambda=0.5 dorm=0;
"L1" lambda=0.5 dorm=0;
"L2" lambda=0.5 dorm=0;
"M1" lambda=0.5 dorm=0;
"M2" lambda=0.5 dorm=0;
"M3" lambda=1 dorm=0;
"M4" lambda=1 dorm=0;
"N1" lambda=0.5 dorm=0;
"N2" lambda=0.5 dorm=0;
"N3" lambda=1 dorm=0;
"N4" lambda=1 dorm=0;