appendix hcomplete programs et red penup goto pendown goto stop update + stop - while < while < and not seq += while < and seq -= if tmp seq seq seq seq goto seq seq tmp seq goto seq update += -= seq seq seq goto seq seq seq goto seq seq green update et white penup goto pendown goto seq update return def seq > return stopping return seq stopping return seq stopping return seq def seq seq seq def merge seq mid length stop this copy belongs to 'acha