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𝟏) 𝐘𝐨𝐮 𝐝𝐞𝐜𝐥𝐚𝐫𝐞 𝐚 𝐬𝐮𝐛𝐬𝐜𝐫𝐢𝐩𝐭𝐢𝐨𝐧 𝐨𝐛𝐣𝐞𝐜𝐭.

 𝑠𝑢𝑏𝑠𝑐𝑟𝑖𝑝𝑡𝑖𝑜𝑛!: 𝑆𝑢𝑏𝑠𝑐𝑟𝑖𝑝𝑡𝑖𝑜𝑛;

𝟐) 𝐘𝐨𝐮 𝐚𝐬𝐬𝐢𝐠𝐧 𝐭𝐨 𝐢𝐭 𝐢𝐧 𝐲𝐨𝐮𝐫 𝐧𝐠𝐎𝐧𝐈𝐧𝐢𝐭 𝐲𝐨𝐮𝐫 𝐬𝐞𝐫𝐯𝐢𝐜𝐞 𝐨𝐛𝐬𝐞𝐫𝐯𝐚𝐛𝐥𝐞.

 𝑛𝑔𝑂𝑛𝐼𝑛𝑖𝑡(): 𝑣𝑜𝑖𝑑 {

 𝑡ℎ𝑖𝑠.𝑠𝑢𝑏𝑠𝑐𝑟𝑖𝑝𝑡𝑖𝑜𝑛 = 𝑡ℎ𝑖𝑠.𝑐𝑜𝑢𝑛𝑡𝑒𝑟𝑆𝑒𝑟𝑣𝑖𝑐𝑒.𝑐𝑜𝑢𝑛𝑡𝑒𝑟𝐶ℎ𝑎𝑛𝑔𝑒𝑑.𝑠𝑢𝑏𝑠𝑐𝑟𝑖𝑏𝑒(𝑐𝑜𝑢𝑛𝑡𝑒𝑟 => 𝑡ℎ𝑖𝑠.𝑐𝑜𝑢𝑛𝑡𝑒𝑟 = 𝑐𝑜𝑢𝑛𝑡𝑒𝑟);

 }

𝟑) 𝐘𝐨𝐮 𝐟𝐫𝐞𝐞 𝐢𝐭 𝐢𝐧 𝐲𝐨𝐮𝐫 𝐧𝐠𝐎𝐧𝐃𝐞𝐬𝐭𝐫𝐨𝐲 𝐰𝐡𝐞𝐧 𝐲𝐨𝐮'𝐫𝐞 𝐝𝐨𝐧𝐞.

 𝑛𝑔𝑂𝑛𝐷𝑒𝑠𝑡𝑟𝑜𝑦(): 𝑣𝑜𝑖𝑑 {

 𝑡ℎ𝑖𝑠.𝑠𝑢𝑏𝑠𝑐𝑟𝑖𝑝𝑡𝑖𝑜𝑛.𝑢𝑛𝑠𝑢𝑏𝑠𝑐𝑟𝑖𝑏𝑒();