Climb and Descent Profile? (How to Read)

How do I read a climb and descent profile. I don’t know how to decode them!

Can someone please help me?

Climb Profile 250/310/84

Descent Profile 84/310/250

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250 / 310 / 84 means maintain 250 IAS under FL100 / Maintain 310 IAS between FL100 - FL280 / then maintain mach speed of 0.84 above FL280. Same goes for descent but otherway round if this makes sense.