sequences.lazy.sliced: implement 'front' and 'back'.
sequences.lazy.sliced: implement 'front' and 'back'.

iamrekcah/clay,aep/clay,iamrekcah/clay,iamrekcah/clay,mario-campos/clay,jckarter/clay,aep/clay,jckarter/clay,jckarter/clay,aep/clay,aep/clay,mario-campos/clay,jckarter/clay,jckarter/clay,mario-campos/clay,iamrekcah/clay,iamrekcah/clay,jckarter/clay,mario-campos/clay,aep/clay,aep/clay,mario-campos/clay