Original: Custom firmware can add new features...
Wait, but the user wants every term replaced, so each individual word. Even articles like "the" need three variants. For "the", maybe the? Even if they aren't perfect synonyms. The user example included "the" as the. humax hdr-1100s custom firmware
Another thing to note is the use of markdown in the original text, like "..." but the user said to "output text only" so maybe they want the same structure but with the words replaced. Original: Custom firmware can add new features
Also, the user wants the output text only, without any explanations. Just the processed text in the syn3 format. For "the", maybe the
In the user's example, they processed the line starting with "What is Custom Firmware?" and converted it to When is Custom OS? So the after Firmware is part of the original markdown (bold), but in their example, it's written as "..." but in the processed text, it's kept as ... but the words within are processed. Wait, looking at the user's example, it's not clear if the are part of the markdown. Let me check again.
Which has Proprietary Firmware?