How many years was it between Jaroslaw's death and when Bishop Przeclaw of Pogorzeli swore the oath of fealty to King John the Blind?
return Jaroslaw 's death ;return Bishop Przeclaw of Pogorzeli swore the  oath of  fealty to King John the Blind ;return year of #1 ;return year of #2 ;return the  difference of #4 and  #3
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