$ LC_ALL=C grep -cE '^[a-z]{$chars}$' /usr/share/dict/$dictionary
| Dictionary | 4 chars | 5 chars | 6 chars | 7 chars | 8 chars | 9 chars | 10 chars | 11 chars | 12 chars |
|---|---|---|---|---|---|---|---|---|---|
| american-english-small | 1,630 | 2,606 | 4,363 | 5,599 | 5,509 | 4,627 | 3,347 | 2,077 | 1,155 |
| american-english | 2,051 | 3,466 | 5,886 | 8,006 | 8,407 | 7,464 | 5,827 | 3,958 | 2,523 |
| american-english-large | 3,036 | 5,464 | 9,531 | 13,531 | 15,284 | 14,829 | 12,371 | 9,229 | 6,284 |
| american-english-huge | 4,730 | 9,942 | 18,138 | 27,232 | 33,871 | 33,011 | 28,702 | 22,542 | 16,426 |
| american-english-insane | 7,124 | 15,900 | 30,694 | 43,913 | 54,443 | 56,341 | 51,772 | 43,281 | 33,865 |