40 xti Contents 32 Procedure Learning via Adaptively Biased Hillcimbing 205 32.1 Introduction 205 32.2 Hillclimbing 206 32.3 Entity and Perception Filters 207 32.3.1 Entity filter 207 32.3.2 Entropy perception filter 207 32.4 Using Action Sequences as Building Blocks 208 32.5 Automaticall