Common and Proper Nouns. A common noun names a general person, place. or thing. examples: I went to the city. The man was kind. A proper noun names a specific person, place, or thing. Always capitalize the first letter of a proper noun. examples: I went to San Francisco.
The width of the steps is flexible. A wide deck staircase (5 feet and beyond) feels graceful and looks it too. A narrow one, for example 3 feet wide, might feel cramped. Very wide steps are great...if you have the room for them and they work with your design. These usually work best with a single set of deck stairs.
As for number of stringers, in my town you would need at least 4 stringers for a 48 inch wide step for an outside stair. This refers to cut stringers, not solid, I just built a set of stairs for my deck, I used cut stringers, 42 inch wide steps, needed four stringers.Each step was 6 inch rise, 12 inch tread. 12 to 1 slope would indeed be very flat, if you go with 6 inch rise per step you are going to need 6 steps for a 42 inch elevation difference, and your stringer would be about 6 feet long if you went with a 12 inch tread.