D

language: "d"

// a b c       ->      // a b ¦
// d   ¦               // c d ¦
/* a b c               /* a b ¦
   d   ¦                  c d ¦
*/     ¦               */     ¦
/+ a b c               /+ a b ¦
   d   ¦                  c d ¦
+/     ¦               +/     ¦
x x x x x              x x x x x

/// a b c       ->      /// a b ¦
/// d   ¦               /// c d ¦