l modes of reasoning from each other is whether each of them
is exact or approximate in character.  In this light, deduction is the only
one the three types of reasoning that can be made exact, in essence, always
deriving true conclusions from true premisses, while abduction and induction
are unavoidably approximate in their modes of operation, involving elements
of fallible judgment in practice and inescapable error in their application.

The reason for this is that deduction, in the ideal limit, can be
re