where 
 is the percentage done for a given "sheet" - let us normalise this to the range from 0.0 i 1.0 
 is the "quality" - in the range from 0.0 to 1.0;  the power of 0.3 implies that the effect of 
 is weak unless the "quality" parameter is very low
 po m razy, gdzie 
, which is in the range from 0.0 to 1.0. This is a decaying average, with 
. In other words, the most recent tries at a realisation of an exercise have the most influence on the score for that exercise.
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