Please note that a pair has to be separated by : and each pair should have its own line.
Word pair example: front*secondOption:back Word pair example: front:back Word pair example: front:back*.secondOptionBack (in this instance, secondOptionBack is valid but hidden [. at the start]) Add an ! in front of any word in order to set it as "non-interchangeable", that means it only works with definition -> translation and not the other way around.