Честотите са дефинирани като: много чести (> 1/ 10), чести (> 1/ 100, < 1/ 10) и нечести (> 1/ 1 000, < 1/ 100):
Frequencies are defined as: very common (> 1/ 10), common (> 1/ 100 ,< 1/10) and uncommon (> 1/1 ,000, < 1/100):