Breaking it down word by word: - "Once" → After - "you" → they - "have" → hold - "enabled" → switched on - "unknown" → unexpected - "sources" → origins (since "sources" is a proper noun here in the context of Android settings, maybe just keep it as sources but the user said to skip proper nouns, so maybe not change it. Wait, "unknown sources" is a setting term, but in the input text, it's part of the sentence. Hmm, maybe "sources" here is a common noun. Need to decide. The user said "skip proper nouns", but "sources" isn't a proper noun. So proceed to replace it.)
But wait, "and" is repeated. The user's original example shows that each word is replaced with three options, even if it's a repeated word like "and". But in reality, "and" is a conjunction, so maybe "plus", "with", but actually, "and" is a necessary part here. However, the user might not want to change it. Wait, the user's example says "each word with 3 alternatives. Proper nouns stay."
Proceeding step by step, replacing each word with three possible synonyms, ensuring the meaning isn't lost. This might take time, but it's important to maintain the original structure and make the synonyms fit naturally. Also, note that some words might have multiple parts of speech, so need to choose the correct part. For example, "look" as a verb versus "look" as a noun in "looks like." In the context of the sentence, "looks like" is a verb phrase, so verb synonyms would apply. However, in the replacement for "looks," maybe seems is acceptable if the user allows repetition. But the instructions say three variants, so maybe seem for "looks." Breaking it down word by word: - "Once"
"to" → toward
Now moving to the next paragraph: "Install the APK: Once you have downloaded the APK, you can install it on your device. To do this, go to the location where you saved the APK, then tap on it to begin the installation process. Follow the prompts to complete the installation." Need to decide
"on" → onto
"Careful who you prank" can be consider the target carefully. "Reputable websites" might become secure platforms. The user's original example shows that each word
"is" → are