The columns are ordered as follows:
difficulty_level question answer1 answer2 [...] [#note]
If a pound sign (#) appears as the first character in the first column, the row will be ignored. This can be used to comment out a row.
Column entries containing spaces (e.g. questions) do not need to be quoted. However, double quotes can be used to enclose these entries (as generated by some tools) if desired. Due to this allowance, if a double qoute literal is to appear within the column, the double quote must be doubled (e.g. ""). See the example below.