YES
  TPA v.1.0

Result: TRS is terminating

Default interpretations for symbols are not printed. For polynomial interpretations
and semantic labelling over N\{0,1} defaults are 2 for constants, identity for unary
symbols and x+y-2 for binary symbols. For semantic labelling over {0,1} (booleans)
defaults are 0 for constants, identity for unary symbols and disjunction for binary symbols.

[1]  TRS loaded from input file:
(1) a -> g(c)
(2) g(a) -> b
(3) f(g(X),b) -> f(a,X)

[2]  Use following polynomial interpretation:
[a] = 3
[b] = 3
rest default

  Remove rules with left hand side strictly bigger than right hand side:
(1)

[3]  Use following polynomial interpretation:
[g(x)] = x + 1
rest default

  Remove rules with left hand side strictly bigger than right hand side:
(2)-(3)

[4]  Since there are no remaining rules, termination is proved!

../tpdb/TRS/Rubio/mfp90b.trs, 0., Y
Couldn't open file <60>: 60: No such file or directory