0 400 400   //line comment
 0 400 400   
 0 400 400   /* block comment */
 0 400 400   
 2 400 401 + /* block comment on 
 0 401 400 | multiple lines */
 0 400 400   
 0 400 400   /* //line comment within block comment */
 0 400 400   
 0 400 400   // /*block comment within line comment */
 0 400 400   
 0 400 400   // using open-block-comment symbol alone on line comment /*
 0 400 400   
 0 400 400   /* /* nested block comment */ */
 0 400 400   
 0 400 400   DISPLAY "this line of code is a test". 
 0 400 400   DISPLAY "//this line of code is a test".
 0 400 400   DISPLAY "/* this line of code is a test */".
 0 400 400   
 0 400 400   // using close-block-comment symbol alone on line comment */
 0 400 400   
 0 400 400   // /* improperly closed block comment within line comment */ */
 0 400 400   
 2 400 401 + /* 
 0 401 401 | //line comment 1 in block comment
 0 401 401 | //line comment 2 in block comment
 0 401 401 | //line comment 3 in block comment
 0 401 400 | */
 0 400 400   
 2 400 401 + /*
 0 401 401 | block comment text
 0 401 401 | //line comment text
 0 401 401 | /* inner block comment text*/
 0 401 400 | */
 0 400 400   
 0 400 400   DISPLAY "This is a open-block-comment symbol /*".
 0 400 400   DISPLAY "This is a close-block-comment symbol */".
 0 400 400   
 0 400 400   //* line comment plus * looks like open-block-comment
 0 400 400   
 0 400 400   
 0 400 400   DISPLAY "this line of code is a test".
 0 400 400   
 2 400 401 + /*display statement within block comment
 0 401 401 | DISPLAY "this is a string".
 0 401 400 | */
 0 400 400   
 0 400 400   DISPLAY "//line comment within string".
 0 400 400   
 0 400 400   DISPLAY "/* //line comment within block comment within string */".
 0 400 400                                                                           
 0 400 400   /* Improperly closed block comment */ */
 0 400 400   
 0 400 400   DISPLAY "this line of code is a test".
 0 400 400   
 0 400 400   DISPLAY "line comment with leading whitespace". // this is a line comment
 0 400 400   DISPLAY "line comment without leading whitespace".// this is not a line comment
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 0 400 400   
 1 400 400