Adverbial clauses of purpose often begin with so that:
She sat forward so that she could see into the car’s wing mirror.
Infinitive clauses are also frequently used for this purpose, introduced by in order to, so as to, or just to:
Someone may grab your collar with both hands in order to headbutt you in the face.
In the example above in order to could be replaced by either so as to or to.
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