  S. Baker (2019), B. B\'ar\'any and A. K\"{a}enm\"{a}ki (2019) independently
showed that there exist iterated function systems without exact overlaps and
there are super-exponentially close cylinders at all small levels. We adapt the
method of S. Baker and obtain further examples of this type. We prove that for
any algebraic number $\beta\ge 2$ there exist real numbers $s, t$ such that the
iterated function system $$ \left \{\frac{x}{\beta}, \frac{x+1}{\beta},
\frac{x+s}{\beta}, \frac{x+t}{\beta}\right \} $$ satisfies the above property.
