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 Equivalent symbol switching according to DeMorgan's Laws.

• Every logic symbol has a dual representation symbol.
• According to DeMorgan's Laws, ANDs can be switched to Ors, ORs to ANDs.
• Sometimes it is helpful to switch the symbol to its equivalent part, to make the logic easier to follow.
• GOF can switch any two and more inputs cell with original symbol to its equivalent representation just by mouse clicking.
• The following schematic shows how to change AOI21BX4 cell to its equivalent part.
• Select the cell, mouse-right-click to pop menu, select 'Equivalent symbol' action menu. 

• The cell symbol switches to its new representation.

• The following schematic changes NAND4BX4 and OAI211X4 symbols.

• You can switch back the symbol by select 'Original symbol' action menu.

• AOI21BX4 switches to its original symbol.