<prompt> In which of the following condition PAS test has block positivityALL L1AMLCMLHodgkins lymphoma  <response>: Periodic acid - schiff PAS stain is useful for the diagnosis of ALLs and erythroid and megakoryocytic M6 and M7 type of acute myeloid leukemia.Block positivity in lymphoblast is oberved in ALL L1 cores. 