The repeater is a one of the following sequences: {n}, {=n}, {n:m}
{n} means to repeat a symbol from 1 to n times.
Example: A{3}
{=n} means to repeat a symbol exact n times.
Example: N{=6}
{n:m} means to repeat a symbol from n to m times.
'n' can be '0' in this case. 'm' must be greater than 'n'.
Example X{2:5}
Important: the repeater can be applied to mentioned symbols only. Please consider block with the optional feature for functions or expressions.