Spaced Repetition question

Hello there,

I'm currently using two profiles in the flashcard section; simple for learning my daily stuff and then Spaced Repetition for going over everything I've been learning.

I have however found that when I start the spaced repetition profile for flashcards and answer a question wrongly I have the choice of 一 二 三 and if I get it right I have 四 五 六 to choose from. I guess this has something to do with how frequently the card will appear in the future, but I'm not sure.

Could someone please let me know what the numbers mean as I'm currently just clicking any number to continue.

Thanks for your help,

David
 
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