Okla. Stat. tit. 84, § 84-152: Ascertaining intention

In case of uncertainty, arising upon the face of a will, as to

the application of any of its provisions, the testator's intention

is to be ascertained form the words of the will, taking into view

the circumstances under which it was made, exclusive of his oral

declarations. R.L. 1910, Sec. 8382.