Putting this all together, I'll go step by step through the text, replacing each word with three alternatives where possible, ensuring the meaning stays consistent and the instructions remain clear. I'll double-check each replacement for accuracy and natural usage in Spanish. Also, verify that the proper nouns are left untouched. Since the text is in Spanish, the synonyms should also be in Spanish and appropriate to the context of drawing manga characters.

I need to make sure not to alter proper nouns. In the text, "manga" is part of the genre, so it's a proper noun and shouldn't be changed. Same with body parts like "cabeza," "cara," "torso," etc. Wait, no, actually, the user said "Don't touch proper nouns," but "manga" here is part of the title. However, I need to check if any proper nouns are present. The text seems to be all general instructions without specific names or places, so maybe there are no proper nouns to skip.

"Objetos en el fondo" → "elementos en la parte de atrás|figuras en el fondo|cosas en el trasfondo".

"Tus personajes" → "tus figuras|tus modelos|tus personajes".

"Practica" → "ejercita|entrena|practica". "Practica" is repeated, maybe "ejercita|haz|repite".

First, I'll start by reading through the text to understand the context. The title is "Aprende a Dibujar Manga: Un Curso Paso a Paso." I notice "Manga" is a proper noun here, so I shouldn't change that. The course title might be capitalized, but the user says not to touch proper nouns, so maybe "Dibujar" is a verb and should be replaced? Wait, sometimes "Dibujar" might not be a proper noun. Hmm, the user's instruction says not to touch proper nouns, so I need to be careful.

Some parts might be tricky. For example, "borrador" synonyms could be "borrador|goma de borrar|goma". "Borrar" is "to erase", so "borrador" is "eraser". So synonyms are "borrador|goma|planta". Wait, "planta" isn't a synonym. Maybe "goma|plantilla|borrachita". But "plantilla" is a template. Hmm. Maybe "goma|borrador|lápiz de borrar". But that's redundant. Let me think again. Common synonyms for "borrador" are "goma" and maybe "borrador" itself. Maybe "goma|limpia|borrador". Not sure. Alternatively, maybe "borrador|goma|limpiador". Hmm. It's a bit challenging.

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