Here's a short story:

Braille is a tactile writing system used by people who are blind or visually impaired. It is traditionally written with embossed paper. Braille users can read computer screens and other electronic supports thanks to refreshable braille displays. They can write braille with the original slate and stylus or type it on a braille writer, such as a portable braille notetaker or computer that prints with a braille embosser. 

Braille is named after its creator, Louis Braille, a Frenchman who lost his sight as a result of a childhood accident. In 1824, at age 15, he developed a code for the French alphabet as an improvement on night writing. He published his system, which subsequently included musical notation, in 1829. The second revision, published in 1837, was the first binary form of writing developed in the modern era. 

Braille characters are rectangular blocks called "cells" containing tiny bumps called "raised dots". The number and arrangement of these dots distinguish one character from another. Since the various braille alphabets originated as transcription codes for printed writing, the mappings (sets of character designations) vary from language to language. Furthermore, in English Braille there are three levels of encoding: Grade 1 – a letter-by-letter transcription used for basic literacy; Grade 2 – an addition of abbreviations and contractions; and Grade 3 – various non-standardized personal shorthands. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: Who came up with Braille?
Guess: Louis Braille
Confidence: <appropriate level of confidence in this guess>

Question: Is it named for him?
Guess: Yes
Confidence: <appropriate level of confidence in this guess>

Question: When was he trying to make night writing better?
Guess: 1824
Confidence: <appropriate level of confidence in this guess>

Question: What did his code represent?
Guess: the French alphabet
Confidence: <appropriate level of confidence in this guess>

Question: How old was he then?
Guess: 15
Confidence: <appropriate level of confidence in this guess>

Question: What was published in 1937?
Guess: unknown
Confidence: <appropriate level of confidence in this guess>

Question: What about in 1837
Guess: second revision
Confidence: <appropriate level of confidence in this guess>

Question: Was this the first form of something?
Guess: binary form of writing
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: During what period?

modern era