Memes

When they say repeated, they mean repeated for all time ever. Has someone ever used the phrase "how are you today?" ... yes. Has someone ever used the phrase "Pablo Picasso is my favorite brand of watermelon" before? Probably not. There are probably a lot of phrases with varying levels of "have existed before". That previous sentence might be an entirely original one.

But there are plenty of other sentences that can be conveyed that actually exchange information but don't generate new sentences. "So, what do you do for work?" "My favorite color is green" are almost certainly not new sentences.

A better breakdown of my sequence of numbers with the exact same values might be

1, 1, 2, 3,
1, 1, 4, 5,
1, 1, 6, 7,
1, 1, 8, 9
1, 1,
1, 1,
1

And now you have a repeated intro section per line and a sequence of totally unique numbers to that line.

"Most numbers are repeated" could mean that if you pick any given number from all the 21 numbers, it more than 50% likely to be a "1" you pick, just because 1 shows up so often.

"Most numbers are NOT repeated" could mean that if you if you pick any given number from the 9 unique numbers that show up in the set, you are 88% likely to pick a number that only exists once. But if any of these numbers were to be repeated even once, for any reason, that part stops being true.

In language, this just means that some phrases are going to be purely templates like "Hello" but some phrases are informational without being new: "I like turtles" and some are completely never happened before.

And depending on where your mental anchoring is, "we have a lot of repeated phrases in our lives, how could MOST sentences be new" or "repeating things would get old" ... that stat may be hard to believe or surprising, or very obvious.