YES(?, 31)

Initial complexity problem:
1:	T:
		(1, 1)    f0(a, b, c, d, e, f, g, h, i) -> f7(30, 30, 1, 0, 2, f, g, h, i)
		(?, 1)    f7(a, b, c, d, e, f, g, h, i) -> f7(a, b, c + d, c, e + 1, c, g, h, i) [ b >= e ]
		(?, 1)    f7(a, b, c, d, e, f, g, h, i) -> f19(a, b, c, d, e, f, c, c, c) [ e >= b + 1 ]
	start location:	f0
	leaf cost:	0

Repeatedly removing leaves of the complexity graph in problem 1 produces the following problem:
2:	T:
		(1, 1)    f0(a, b, c, d, e, f, g, h, i) -> f7(30, 30, 1, 0, 2, f, g, h, i)
		(?, 1)    f7(a, b, c, d, e, f, g, h, i) -> f7(a, b, c + d, c, e + 1, c, g, h, i) [ b >= e ]
	start location:	f0
	leaf cost:	1

A polynomial rank function with
	Pol(f0) = 29
	Pol(f7) = V_2 - V_5 + 1
orients all transitions weakly and the transition
	f7(a, b, c, d, e, f, g, h, i) -> f7(a, b, c + d, c, e + 1, c, g, h, i) [ b >= e ]
strictly and produces the following problem:
3:	T:
		(1, 1)     f0(a, b, c, d, e, f, g, h, i) -> f7(30, 30, 1, 0, 2, f, g, h, i)
		(29, 1)    f7(a, b, c, d, e, f, g, h, i) -> f7(a, b, c + d, c, e + 1, c, g, h, i) [ b >= e ]
	start location:	f0
	leaf cost:	1

Complexity upper bound 31

Time: 0.176 sec (SMT: 0.167 sec)