Ground floor · your voice
Three and four consonants in a row, with no vowel to rest on. Say the line; if a consonant goes missing or a vowel sneaks in, the word changes and the machine will show you which one you said instead.
I asked for the bill.
This browser cannot listen — Safari and Firefox do not support it. You can still hear the line and read what it turns into when it goes wrong, but the mirror needs Chrome or Edge.
Every sentence here is ordinary. A cluster drilled on its own is a party trick; the point is that it survives inside a sentence at normal speed.