(2) In judging whether a case falls within the meaning of this section, any words which would be liable to rejection under section 65 are to be considered as struck out of the will. 67. Extrinsic evidence admissible in case of latent ambiguity. Where the words of the will are unambiguous, but it is found by extrinsic evidence that they admit of applications, one only of which can have been intended by the testator, extrinsic evidence may be taken to show which of these applications was intended. 68. Extrinsic evidence inadmissible in case of patent ambiguity or deficiency. Where there is an ambiguity or deficiency on the face of the will, no extrinsic evidence as to the intentions of the testator shall be admitted. 69. Meaning of clause to be collected from entire will. The meaning of any clause in a will is to be collected from the entire instrument, and all its parts are to be construed with reference to each other, and for this purpose a codicil is to be considered as part of the will. 70. When words may be understood in restricted sense, and when in sense wider than usual. General words may be understood in a restricted sense where it may be collected from the will that the testator meant to use them in a restricted sense; and words may be understood in a wider sense than that which they usually bear, where it may be collected from the other words of the will that the testator meant to use them in the wider sense. 71. Which of two possible constructions preferred. Where a clause is susceptible of two meanings, according to one of which it has some effect, and according to the other it can have none, the former is to be preferred.