What do guide letters in a dictionary help the reader to do?

Guide letters in a dictionary serve a vital function by helping the reader locate words more easily. Positioned on the side of dictionary pages, these letters indicate the range of words found on that page, effectively narrowing down the search. For instance, if a reader is looking for a word starting with the letter "M," they can quickly scan to the pages with guide letters indicating that words starting with "M" are present. This feature makes navigation more efficient, allowing users to find definitions and other word-related information quickly without having to scan through every entry.