Version 1 - Infinite scroll (estudiar)
Version 2 - Rounds of 10 (estudiar)
Version 3 - Infinite scroll (tener)
Version 4 - Rounds of 10 (tener)
Version 5 - Stop, drop and subjunctive (1/3) [tener]
Version 6 - Stop, drop and subjunctive (2/3) [comer]
Version 7 - Stop, drop and subjunctive (3/3) [Mixed verbs]
Version 8 - Always, sometimes, never subjunctive?