Our experiments on the Instructional corpus consider the same 26 primary relations (e.g., GOAL:ACT, CAUSE:EFFECT, GENERAL-SPECIFIC) used in (Subba and Eugenio, 2009) and also treat the reversals of non-commutative relations as separate relations.
pREpARATION-ACT and ACT-pREpARATION are two different relations.