<transcript><audio_112>I have the word continue then it's it's possible to to to be correct python so that's important and these are the first sets and this is going to be quite important to understand some of the restrictions that we have so basically a first sets is all the words that the</transcript><caption><image_113>The image is a screenshot of a video call with a beige background. On the left side of the image, there is a black circle with the text "while" and "expr" written in white. Below the circle, there are two options - "while", "expr", and "exp". On the right side, there appears to be a profile picture of a man wearing a headset and holding a microphone. The man appears to have a serious expression on his face.</caption><transcript><audio_114>grammar can start with so there are some limitations of the grammar um so imagine that you have this grammar um so is the word do and a rule a and then the world do and Rule B and we have these these first sets so the word a we don't know what it is but we know that it can start</transcript><transcript><audio_115>with the letter a and then the letter b and the r the rule B can start with the letter a and the letter c and then we have this Source over here well uh if we need to decide if it's this version or this version um it's very easy to do</transcript><caption><image_116>The image is a screenshot of a video editing software interface. There are three panels in the image, each with a different color scheme. 

The first panel on the top left has a black background with white text. Below the text, there is a code written in white text that reads "LE: (0) "A "white" expr" (1) "White" expr". The code is written in a simple, sans-serif font and is centered on the screen.

On the right panel, there are two smaller panels with the same text. The first panel has a green background and the second panel has the same green background. The text is written on a white background and is in a larger font size than the rest of the text.
- There is also a small image of a person's face on the bottom right corner of the image. The person appears to be wearing a headset and is looking directly at the camera.</caption><transcript><audio_117>because we have the letter B here and then we look at the letters that a can start with and then we see B but B is not in in in this other rule so we know that this the first option so if we have this source code it has to be this version over here the first possibility</transcript><transcript><audio_118>all about what if we have the same first sets but we have this version over here the there is do and then an a well do is do okay so both start with do that's that's okay and then we have an A so a</transcript><transcript><audio_119>can start with a yes uh so it can start with a um so it has to be in the first sets of a so maybe it's that possibility but look it can also be that possibility over there because the first set of B also starts with a because it's repeated over here so we don't know actually</transcript> I have the word continue then it's it's possible to to to be correct python so that's important and these are the first sets and this is going to be quite important to understand some of the restrictions that we have so basically a first sets is all the words that the grammar can start with so there are some limitations of the grammar um so imagine that you have this grammar um so is the word do and a rule a and then the world do and Rule B and we have these these first sets so the word a we don't know what it is but we know that it can start with the letter a and then the letter b and the r the rule B can start with the letter a and the letter c and then we have this Source over here well uh if we need to decide if it's this version or this version um it's very easy to do because we have the letter B here and then we look at the letters that a can start with and then we see B but B is not in in in this other rule so we know that this the first option so if we have this source code it has to be this version over here the first possibility all about what if we have the same first sets but we have this version over here the there is do and then an a well do is do okay so both start with do that's that's okay and then we have an A so a can start with a yes uh so it can start with a um so it has to be in the first sets of a so maybe it's that possibility but look it can also be that possibility over there because the first set of B also starts with a because it's repeated over here so we don't know actually
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