Start slowly, then build speed. Can you do them? Leave me a comment.
/P/ is voiceless - only air
/B/ is voiced - engages the vocal chords
CAPS are for intonation/pitch change to create the rhythm of stressed syllables/words.
/P/ & /B/ -
PApa BAba buys PINEapple bubble GUM-balls.
PEter PIper picked a PECK of PICKled PEPpers.
BARney BABbitt bagged a BUSHel of big BLUE berries.
A big black BUG, bit a big black DOG, on his big black NOSE.