def split_into_connections(self, traj):
c, i, d = self.assign_trajectory(traj)
l_traj = []
traj_mode = 0
t = Trajectory()
first = None
for index, snapshot in enumerate(traj):
if (c[index] != -1 and i[index]==0 and traj_mode == 0):
# core set
first = snapshot
elif (i[index] != 0 and first is not None):
# in void
t.forward(snapshot)
traj_mode = 1
elif (c[index] != -1 and i[index]==0 and traj_mode == 1):
t.insert(0, first)
t.forward(snapshot)
l_traj.forward(t)
t = Trajectory()
first = snapshot
traj_mode = 0
return l_traj
