I have a list of 1000 sublists and each sublist is length 400. I’d like to produce a new set containing only those sublists where element 25, 75 and 250 satisfy some criteria.

The following works on sublists of length 3 with some toy criteria:

`Cases[set, {a_, b_, c_} /; 1 < a < 5 && 0 < b < 4 && 4 < c < 8]`

, where `set`

is the list of 1000 sublists.

How may I construct a list similar to `{a_,b_,c_}`

but that is instead 400 elements? That is I want to produce a list like `{a1_,a2_,a3_,....,a_400}`

. Probably it’s simple but I’ve been playing about with array and Append etc. and not found a way.