To save' is a gerund and it is functioning as the subject of the sentence.
<h3>What is a gerund?</h3>
A gerund can be regarded as a verb form which functions as a noun.
A gerund do appear in sentence as form of blend of verbs and nouns, which now perform the function of a noun in that sentence.
Therefore, To save ,in this sentence stand for the subject, which is functioning as a noun in the statement .
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