To prove that fractions are countable we need to make a list of them. Which is NOT true about any enumeration proof? jus

[answerhappygod]

To prove that fractions are countable we need to make a list of
them.
Which is NOT true about any enumeration proof?
just putting fractions into a matrix is enough
we should skip repetitions
the list should clarify what is a position of each fraction on
the list
numbers on diagonals have the same sum of denominator and
numerator
there is a way to figure out the formula for this sequence
adding few extra fractions to the list does not change the
argument
we can concentrate on positive fractions first
cardinality of fractions is smaller than cardinality of real
numbers