.... The file is organized with Quiz lines on an even numbered line, and the Answer lines on odd-numbered lines, as shown in this example for Thai language training:
Hello [-- on line #0 --)
Saw wat dee kup [-- one line #1--]
Excuse me [-- on line #2 --]
Kho thoet kup [-- on line #3 --]
I speak Thai a little [-- on line #4 --]
Phom phut paasaa Thai dai nitnoi kup [-- on line #5 --]
(Another even-numbered quiz line)
(Another odd-numbered answer line, etc.)