The spelling of "spill bean" may seem straightforward at first, but a closer look reveals some tricky phonemes. The "sp" sound is pronounced with aspiration, represented in IPA as /sp/. The second syllable, "ill," includes a relaxed "i" sound, /ɪ/, followed by a vocalic "l," represented as /l̩/. Finally, "bean" has the typical "ee" vowel sound, represented as /i/, and ends with a nasal "n," represented as /n/. Overall, the spelling of "spill bean" can be a challenge for those unfamiliar with its unique phonetic makeup.