$ gt tallymer occratio -scan -output unique nonunique -mersizes 10 13 17 -esa reads
# distribution of unique mers
10 223755
13 465859
17 455449
# distribution of non unique mers (counting each non unique mer only once)
10 135526
13 49611
17 39769
# space peak in megabytes: 0.06
# mmap space peak in megabytes: 3.93
