just a little differently.

Let h mean **h**alf or a sort-of 5 in the digit where an h is. Let z mean **z**ero.

Here are some example numbers.

6250 < 6h00 < 6750 (The h here means 500 plus or minus 250, exclusive)

6750 <= 7z00 <= 7250 (The z here means plus or minus 250, inclusive)

1.5025 < 1.50h < 1.5075 (The h here means 0.005 but with plus or minus 0.0025)

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