 Use of these alternative symbols can make logic circuit diagrams much clearer and help to show accidental connection of an active high output to an active low input or vice versa.Any connection that has logic negations at both ends can be replaced by a negationless connection and a suitable change of gate or vice versa.Any connection that has a negation at one end and no negation at the other can be made easier to interpret by instead using the De Morgan equivalent symbol at either of the two ends.