I am new to this forum. I try to find the appropriate model for the following 
data set with lme4:

Each individual subject goes through 3 conditions ("Group", within-subject 
factor). These 3 conditions include 9 items (3 items in each condition, but the 
items differ in each condition). Score (4th column not represented above) is a 
continuous dependant variable (reaction time).I am interested in the fixed 
effect of the "Cond" variable and also would like to take into account the 
dependencies between my factors, but I have difficulties to know if my factors 
should be considered as nested or crossed.Does the following model seems 
correct to you ?Score~1+Cond+(1|Subject)+(1|item).Any help would be much 
appreciated.
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