| R(t) (Naïve) = N * d(t) + a(t) |
| R(t) (WikiSensing, when cached) = c(t) + (N - O) d(t) + a(t) |
| R(t) (WikiSensing, when fetched form database) = d(t) + (N - O) d(t) + a(t) |
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