The word "hreha" is spelled according to the phonetic principle of the Slovak language, where each individual letter represents a specific sound. The spelling of "hreha" using the IPA transcription system would be /ˈɦɾɛɦa/. The first two letters represent the voiceless glottal fricative sound, followed by the rolled "r" sound, and ending with the voiced glottal fricative sound. This unique combination of sounds creates the distinct pronunciation of the Slovak word "hreha."