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What number represents “readable” on the readability scale?

ICAO Annex 10
Volume II
Chapter 5

5.2.1.8.4 PANS.- When the tests are made, the following readability scale should be:

Readability Scale

1 Unreadable
2 Readable now and then
3 Readable but with difficulty
4 Readable
5 Perfectly readable

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