If the dog-pulled sleds in the left and right images move forward over snow at a leftward angle.
return the  left image ;return sleds in  #1 ;return #2 that are dog-pulled ;return snow in  #1 ;return if  #3 move forward over #4 at a  leftward angle ;return the  right image ;return sleds in  #6 ;return #7 that are dog-pulled ;return snow in  #6 ;return if  #8 move forward over #9 at a  leftward angle ;return if  both  #5 and #10 are true
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