How to calculate least count of a stopwatch

What’s the process of observing someone actually working in a career that interests you?

Design a pos circuit that displays the letters a through j on a seven-segment indicator. the circuit has four inputs w, x, y, and z which represent the last 4 bits of the uppercase ascii code for the letter to be displayed. thus, if wxyz = 0001 then "a" will be displayed. (any answer with 22 or fewer gates and inverters, not counting any for the inputs, is acceptable)

When you mouse over and click to add a search term this(these) boolean operator(s) is(are) not implied. (select all that apply)?