Three forms make the Heavy-Noon pattern especially easy to recognize.
ExampleWhat you see
اِفْعِلُنَّmasculine plural: subject Waaw is dropped; Dhammah remains as its clue
اِفْعِلِنَّsingular feminine: Kasrah appears before Heavy Noon
اِفْعِلْنَانِّfeminine plural: Alif-e-Faasil separates the two Noons
These visible clues will reappear in the larger tables.