A teacher writes six words on a board: “cat dog has max dim tag." She gives three students, Albert, Bernard and Cheryl each a piece of paper with one letter
from one of the words. Then she asks, “Albert, do you know the word?" Albert
immediately replies yes. She asks, "Bernard, do you know the word?” He thinks
for a moment and replies yes. Then she asks Cheryl the same question. She
thinks and then replies yes. What is the word?