Dolch word list fluency in the English language. The compilation excludes nouns, which comprise a separate 95-word list. Between 50% and 75% of all words used in schoolbooks, library books, newspapers, and magazines are a part of the Dolch basic sight word vocabulary. These lists of words are still assigned for memorization in American elementary schools. Although most of the 220 Dolch words are phonetic, children are sometimes told that they can't be "sounded out" using common sound-to-letter implicit phonics patterns and have to be learned by sight; hence the alternative term, "sight word". The list is divided according to the grades in
Letter frequency word variants when counting, such as "abstracts", "abstracted" and "abstracting" and not just the root word of "abstract". This system results in letters like "s" appearing much more frequently, such as when counting letters from lists of the most used English words on the Internet. A final variant is to count letters based on their frequency of use in actual texts, resulting in certain letter combinations like "th" becoming more common due to the frequent use of common words like "the". Absolute usage frequency measures like this are used when creating keyboard layouts or letter frequencies in old fashioned printing