b | is setting forth[6]
a | the firmament.
D | d | Day after day[7]
e | uttereth[8] speech,
d | And night after night
e | sheweth knowledge.
E | f | There is no speech (what is articulate)
g | and there are no words (what is audible);
g | and without being audible,
f | is their voice (what is articulate).