Before revision:  Let \Delta = \{\delta _0,\delta _1,\delta _2,\ldots \} be a countable set of real numbers which has at least m+1 elements.
After revision:  The update rule for the simplest version is x_{n+1 = \{\delta _0,\delta _1,\delta _2,\ldots \} be a countable set of real numbers which has at least m+1 elements.