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Please why $ in line 4 not in blue ? that mean vscode don't recognize it. i am newbie in coding on vscode enter image description here

khelwood
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GTF Music
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    **DO NOT post images of code, data, error messages, etc.** - copy or type the text into the question. Please reserve the use of images for diagrams or demonstrating rendering bugs, things that are impossible to describe accurately via text. For more information please see the Meta FAQ entry [Why not upload images of code/errors when asking a question?](https://meta.stackoverflow.com/questions/285551/why-not-upload-images-of-code-errors-when-asking-a-question) Please [edit] your question to include the text. – VLAZ May 20 '22 at 13:08

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