You have to take this that conditionality into account. Namely:
When this is, that is.
From the arising of this comes the arising of that.
When this isn’t, that isn’t.
From the cessation of this comes the cessation of that.
In this quartet, there are things that arise due to composition and things that arise due to consequence.
Composition:
when this is, that is; when this isn’t, that isn’t.
Something that arises due to composition is a simultaneous kind of arising. E.g.
If you paint a solid red circle on a blank piece of paper, the shape appears simultaneously with the colour red. Without the colour red, there would be no circle. But because there is the colour red, one can perceive the circle. I.e.
when red is, the circle is
when red isn’t, the circle isn’t
The suffering of birth, aging, pain etc. is a result of this simultaneous arising due to composition. I.e.
When birth and craving is, suffering is.
when birth and craving isn’t, suffering isn’t
When ageing and craving is, suffering is.
When ageing and craving isn’t, suffering isn’t
When pain and craving is, suffering is.
When pain and craving isn’t, suffering isn’t
Because craving is assumed to be present in all cases, you can use the shorthand of birth is suffering, ageing is suffering, pain is suffering etc.
Consequence:
From the arising of this comes the arising of that; From the cessation of this comes the cessation of that.
Something that arises due to consequence is a sequential kind of arising. E.g.
If you fertilise a chicken egg, a chick will be born. I.e.
from the arising of a fertilised chicken egg comes the arising of a chick
The suffering of lamentation is a result of this sequential arising due to consequence. I.e.
from the arising of craving comes the arising of lamentation
from the arising of craving comes the arising of suffering
Given that craving is the singular point of origin for both lamentation and suffering, one can then say:
when lamentation is, suffering is
when suffering is, lamentation is
when lamentation isn’t, suffering isn’t
when suffering isn’t, lamentation isn’t
Because both appear and disappear with each other, you can use a shorthand to say lamentation is suffering.
Note that whether phenomena arises simultaneously or sequentially, craving plays an integral role. Once craving is uprooted, suffering ceases:
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In the case of simultaneous kinds of arising: when pain and craving is, suffering is. Due to the requirement for both pain AND craving to be present, simply removing craving is enough to cause suffering to cease.
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In the case of sequential kinds of arising: from the arising of craving comes the arising of lamentation. Due to the requirement of craving to be present for lamentation to ensue, simply removing craving is enough to cause lamentation to not ensue. Because craving is what also causes suffering to ensue, simply removing craving is enough to cause suffering to not ensue. In such a circumstance, neither lamentation nor suffering arise.