The phrase 'to avoid mix up' is correct and usable in written English.
You can use it when you want to express that you are trying to avoid confusion or misunderstanding. For example: "I added labels to each file to avoid mix up."
I have never encountered anybody confusing Tschechei and Tschetschenien before but if you want to avoid mixing up the names it may help to know a little more about those countries than just the name.
To avoid mixing up or contamination, we developed a dedicated module for production of F-FPTP for clinical application.
Keep non-rechargeable batteries separate, to avoid mixing up batteries.
Use pet names such as "honey" or "sweetheart" to avoid mixing up their names.
It will also, they hope, allow them to avoid mix-ups like the episode last week when the city's health commissioner, Dr. Thomas R. Frieden, trying to keep the public informed, announced that students at Ascension School, a Roman Catholic school on the Upper West Side, appeared to be sick with swine flu when further testing showed they had only a more common strain of flu.
To avoid mix-ups in the store, the experimental materials were carefully tagged before being stored.
Different operational areas should be clearly defined and separated, especially regarding the unidirectional flow of materials, precursors and finished products to avoid mix-up and unintended use.
She said, "I would come home from work crying — 'How can you write such rude things?' He'd go, 'You don't understand, babe, this is just how guys talk.' " (Advice from the blog: "Always call your girl 'babe,' " to avoid mixing up names).
For this reason, data within small time before crashes should be rejected to avoid mixing up crash-influencing and crash-influenced data.
To avoid mixing up of cryptic variation within a group, we run further AMOVAs with populations assigned as sample localities, despite the relatively low sample size per locality.
