 Here we are given n sets of dD cuboidal items and we have to choose exactly one (resp. at most one for the knapsack variant) item from each set and then pack the chosen items.
<clarity>  Here we are given n sets of dD cuboidal items and we have to choose exactly one (resp. at most one for the knapsack variant) item from each set and then pack the chosen items.
 Here we are given n sets of dD cuboidal items and we have to choose exactly one item from each set and then pack the chosen items.