Book,  Chapter

1        I,  IX  |     flew like the wind. Not an obstacle on the plain, white and
2        I,  XII |    there was not the slightest obstacle to impede them. The tarantass
3       II,  VI  |    Michael?”~“I must not be an obstacle to your journey! Your father
4       II,  VIII|    began to hope that no fresh obstacle would delay his progress.~
5       II,  VIII|      long as no insurmountable obstacle stopped him. Later, he would
6       II,  X   | perhaps even an insurmountable obstacle which would stop the raft.~
7       II,  XI  |        offer an insurmountable obstacle to the passage of the raft.