Unique rules when forming that grammar are highlighted like this.
Example sentences follow these rules too!
Joining and Nesting Markers:
Verb[た/る] - means that dictionary form and ta form are accepted.
Verb[causative[て]] - means て form of the causative form of the verb.
(A) のみだ is a formal expression with a bookish nuance, indicating that there is nothing other than (A). With verbs that indicate movement, continuation, or hope (like 願う、祈る、練習、待つ、前進、行く、走る) it is often used to express the only possible course of action, in a way similar to しかない. In this use, するのみ can be replaced with あるのみ for an additional literary feel, without changing the meaning.