code cleanup for subsamples in blocked sampling
code cleanup for subsamples in blocked sampling

tfmorris/dedupe,01-/dedupe,pombredanne/dedupe,dedupeio/dedupe,tfmorris/dedupe,nmiranda/dedupe,neozhangthe1/dedupe,datamade/dedupe,davidkunio/dedupe,01-/dedupe,dedupeio/dedupe,davidkunio/dedupe,pombredanne/dedupe,neozhangthe1/dedupe,nmiranda/dedupe,datamade/dedupe