Task: Question Answering
Input (English): We try 3 variants of each training set to fine-tune our models: (i) the original one in English (Orig), (ii) an English paraphrase of it generated through back-translation using Spanish or Finnish as pivot (BT-ES and BT-FI), and (iii) a machine translated version in Spanish or Finnish (MT-ES and MT-FI). 
 Question: What languages do they use in their experiments?
Output (English): English Spanish Finnish