We focus upon pairs of words very often which are the same in some areas and different in other areas.
“Dad worked in a warehouse when I was little and I didn't see him for three years as he was doing all the overtime God gave him to buy me new ballet shoes, or a new tutu.”
“On two occasions I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.”