Processing sample file with blk_len=2: 8217c8fb7675a95008f9089d883gapk Processing sample file with blk_len=4: 8217c8fb7675a95008f9089d883gapk Processing sample file with blk_len=8: 8217c8fb7675a95008f9089d883gapk Processing sample file with blk_len=16: 8217c8fb7675a95008f9089d883gapk Processing sample file with blk_len=32: 8217c8fb7675a95008f9089d883gapk chunk null_context: depth=0