Numbers of Ailment

Need help for understanding ailments number limits please~

So far as I know:

Poison has number limit and can be added up by "+1 poison same time" nodes and gem or unique.

Shock only has 1 on enemy by given enough lightning damage and hi shock chance, as long as the lightning damage goes on, the shock ailment stays. And from asndcy of Stormweaver, you can apply 2 shcoks same time.

Chill works same like Shock, hi cold damage inflict chill and keeps on, also Stormweaver can apply 2 Chills.

Freeze and Electrocution are build-up ailments need damage keeps going and Electrocution need a source from skills or gem.

And my question is:

Does Bleeding and Ignite have numbers? Because I read the words:
quote " Aggravated Ignite
Ignite that has been Aggravated deals 100% extra damage.

Once an Ignite has been Aggravated, it will remain Aggravated until its duration expires.

Just like Bleeding, each Ignite Debuff can be Aggravated, or not, independently of others on the target." quote

What the " each" means?

THX~

All the ailments have a limit of 1 by default.

The damaging ailments you apply all stay on the mob, they all have there own damage and duration locked in when you apply them.
Only the highest damage ailment of each type will apply and will deal damage until it's timer runs out or you apply a stronger version.
All the timers of the ailments run down and when the timer of the highest damage ailment runs out it will switch to the next highest for the remainder of it's timer.