The simulation should be initialized with four parameters: the size of the $2-$dimensional world people

inhabit $($sidelength$,$ default $40$ squares per side$),$ the maximum time to run the simulation for

$($maxtime$,$ default $1000$ days$),$ the number of people $($npeople$,$ default $100),$ and the number of

initially infected people $($ninfected$,$ default $1).$

People

Each person will be associated with a number of pieces of information: $($i$)$ their x coordinate $($an

integer between $0$ and the size of the world$-1),($ii$)$ their