By using shnider laddre plc $,$ program the following process by using ladder language: Suppose that there is a building consisting of ten floors from $0$ to $9.$ If a fire occurs on a particular floor, the Alarm device on that floor works, and after $15$ seconds the previous floor and the next one works and continues like this until all floors are activated Example if fire occurs on level $4$ Alarm in level $4$ works for $15$ seconds then level $3$ and level $5$ works for $15$ seconds then level $2$ and level $6$ works for $15$ seconds then level $1$ and level $7$ works for $15$ seconds then level $0$ and level $8$ works for $15$ seconds then level $9$ works for $15$ seconds then level $2$ and level $6$ works for $15$ seconds then level $1$ and level $7$ works for $15$ seconds then level $0$ and level $8$ works for $15$ seconds then level $9$ works for $15$ seconds