Replace several values in a column

I would like to use the replace function for one column to replace each value with another one. Function Replace does it for one value: Replace({FromWeek},"48","CW48" does work.

What is the correct statement to define a row of'replace'-statements for this column.

Replace({FromWeek},"48","CW48" AND Replace({FromWeek},"49","CW49" etc. leads to error messages. Does anyone have an idea?

Thanks, Martin