The spelling of the word "tisei" may seem unusual, but it can be explained using the International Phonetic Alphabet (IPA). The initial "t" sound is followed by a long "i" sound, represented in IPA as /aɪ/. The "s" is pronounced with a soft "s" sound, or /s/. Finally, the "ei" ending is pronounced as /eɪ/. Together, these sounds create the unique spelling of "tisei." While it may look unfamiliar, understanding the phonetic breakdown can help with proper pronunciation.