How many children can say '2' at most in a line of five distinct heights?

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Q1.

What does the number '1' indicate about a child in line?

Q2.

If a child at the end of a line says '0', what does that mean?

Q3.

Is it possible for all five children to say '0' when arranged?

Q4.

What sequence indicates that the tallest child is in the middle of a line of five?