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Given an arbitrarily weak notion of left-<f>-porosity and an arbitrarilystrong notion of right-<g>-porosity, we construct an example of closed subsetof the real line which is not sigma-left-<f>-porous and is right-<g>-porous. Wealso briefly summarize the relations between three different definitions ofporosity controlled by a function; we then observe that our construction givesthe example for any combination of these definitions of left-porosity andright-porosity.

On the nonexistence of a relation between \sigma-left-porosity and \sigma-right-porosity