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When the base number is 2 or 3 or 4 then the quantity of (X + X) + (X + X) can not be 4.
i.e.

Base 2
X=1 X
XX=10 Xs
XXX=11 Xs
XXXX=100 Xs


Base 3
X=1 X
XX=2 Xs
XXX=10 Xs
XXXX=11 Xs


Base 4
X=1 X
XX=2 Xs
XXX=3 Xs
XXXX=10 Xs