Fields colored blue are optional.
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Number of ICs: "ICs" refers to Integrated Circuits that are of digital, analog or mixed nature. This also includes opto-isolators and Hall sensors.
Number of the above ICs over 20 pins: This refers to any of the above ICs that are DIP or surface mount over the count of 20 pins. If you've put 10 ICs in the last field, and 3 of them are over 20 pins, put 3 here.