[ODE] how can i use dGeomSetCollideBits()?

[sssa2000]

i am confused with the dGeomSetCollideBits(), how can i set the bit?
the doc said the bit must at least 32bits. i do not know how to set the CollideBits, should i write as this: dGeomSetCollideBits(geo1,00000...0000000)?
 
if i have 3 objects, if one of them had been set the collide bits, Is other two need set the collide bits?
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