Foolish and irrelevant ideas strayed about his mind, as they always do in a time of tedious waiting.
What he needed was to feel that there was another man, an old and tried friend, that he might call him in his sick moments merely to look at his face, or, perhaps, exchange some quite irrelevant words with him.
But many quite irrelevant and inappropriate thoughts sometimes occur even to a prisoner when he is being led out to execution.
I would not, however, have dwelt on such trivial and irrelevant details, if this eccentric meeting of the young official with the by no means elderly widow had not subsequently turned out to be the foundation of the whole career of that practical and precise young man.
The President again briefly, but impressively, admonished him to answer only what was asked, and not to go off into irrelevant exclamations.
The President reminded her, though very politely, that she must answer the questions directly, without going off into irrelevant details.
There are no more uses of "irrelevant" in the book.
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The sentence should be deleted because it introduces information that is irrelevant to the passage.
The writer should deleted the sentence because it provides background information that is irrelevant to the paragraph.