Everybody is shocked after hearing that Master Suo plays karuta with 28 one-syllable cards.  Chihaya, Arata, Taichi, and the other karuta club members do some soul searching as they attempt to move forward.
I determined that there are about 20 cards.
determiné que tienes unas 20 cartas.
determiné que tienes unas 20 cartas.
percebi que são umas 20 cartas.