const a = 1; const b = 2; const c = 3;  
       
     (function firstFunction () {  
       const b = 5; const c = 6;  
       
       (function secondFunction () {  
         const b = 8; 
		 console.log(`a: ${a}, b: ${b}, c: ${c}`);
       
         (function thirdFunction () {  
           const a = 7; const c = 9;  
       
           (function fourthFunction () {  
             const a = 1; const c = 8;  
			 
           })()  
         })()  
       })()  
     })()