YES

This TRS is terminating using the additive interpretation 
len(delta7, X6) =  + 1*X6 + 1
add(delta6, X5, X4) =  + 1*X4 + 1*X5 + 1
from(delta5, X3) =  + 1*X3 + 1
s(delta4) =  + 0
cons(delta3, X2) =  + 1*X2 + 0
0(delta2) =  + 0
fst(delta1, X1, X0) =  + 1*X0 + 1*X1 + 1
nil(delta0) =  + 0
len_tau_1(delta7) = 
add_tau_1(delta6) = 
add_tau_2(delta6) = 
from_tau_1(delta5) = 
cons_tau_1(delta3) = 
fst_tau_1(delta1) = 
fst_tau_2(delta1) = 

Time: 0.001061 seconds
SUCCESS

Statistics:
Number of monomials: 26
Last formula building started for bound 1
Last SAT solving started for bound 1