1.   Hashimoto is the frontrunner for two principal reasons.

2.   His principal reason for making the journey was to visit his family.

3.   I see two principal reasons why this happened.

4.   The other principal reason was the numerous changes in staff caused by transfer, resignation and retirals.

5.   The principal reason for this is the high degree of reliance a human places on linguistic information.

6.   This is the principal reason that the great voices of opera seldom sing popular songs.

7.   What is the principal reason for its existence?

8.   The principal reason for my change of mind is this.

9.   Introducing a new source of authority in the countryside was the principal reason why the emancipators believed volosti had to be created.

10.   The principal reason for so doing is the effect of statutory duties imposed on the landlord in respect of the provision of sanitary facilities in a multi-occupied building.