After a while of this, some folks did indeed sit down and say “Man, that’s a rad way of mapping some of the sounds we speak! Let’s try to map all of them with this rule!”. So they took known sounds for popular objects and mapped their first sounds with the signs they already had for these objects (like they did for [RA]).
So, “house” was represented by the sign:
and pronounced as
[bēt]
They then used that sign, not for “house”[bēt], but for the sound [bē] (first sound), or [b] for us.
became
[b]
and it wasn’t going to represent a house anymore, but a sound.