Linguistic sounds are frequently modified when immediately followed or preceded by certain other sounds. In English, for instance, the !2.- in "science" is not the same sound as the -!£.- in "conscience". and the -!, in "goes into" is not identical with the -.! in "goes to". These phonetic changes may be more or less subtle, and in European languages they are usually not recorded in writing, neither within nor between words. But in ancient India it was the tradition to record them faithfully. In consequence, the beginning and ending of words are sometimes written in a way that makes the words difficult to recognize: these changes are called sandhi (junction). The most common types of sandhi are recorded below (the sign> means: "has changed into").