from_stop_id,to_stop_id,transfer_type,min_transfer_time
G2,G2,0,
O3,O3,0,
G1,O3,0,
G2,O3,0,
G3,O3,0,
G4,O3,0,
G5,O3,0,
G6,O3,0,
G7,O3,0,
G8,O3,0,
G9,O3,0,
O1,G2,0,
O2,G2,0,
O3,G2,0,
O4,G2,0,
O5,G2,0,
O6,G2,0,
O7,G2,0,
O8,G2,0,
O9,G2,0,
O10,G2,0,
O11,G2,0,