# number of nodes
14
# end

# root
11
# end

# left-right order should be retained
# nodes (node#, name, label, instances)
1, "from", "Leaving From (city or airport)"
2, "to", "Going To (city or airport) "
3, "ad", "Adults", "1, 2, 3, 4, 5, 6"
4, "ch", "Children", "0, 1, 2, 3, 4, 5"
5, "inf", "Infants", "0, 1, 2, 3, 4, 5"
6, "depDay", "", "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31"
7, "depMon", "", "Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec, Jan"
8, "retDay", "", "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31"
9, "retMon", "", "Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec, Jan"
10,"cabin", "Flight class", "Economy (lowest price), Economy (flexible ticket), Premier Economy (lowest), Premier Economy (flexible), Business/Club (lowest), Business/Club (flexible), First (lowest), First (flexible), Concorde (lowest)"
11, "", ""
12, "", ""
13, "", "Departing On"
14, "", "Returning On"
# end

# (level by level top-down, start from root)
# edges 
11-1,2,12,13,14,10
12-3,4,5
13-6,7
14-8,9
# end