css - double for loop in stylus preprocessor -

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I'm new to the stylus and I want to iterate for two ends using the stylus preprocessor. This is what I have tried, but definitely not working. 

  .mask: nth-child (1) :: after {top: 0; Left: 0; Height: 20; Width: 20; } .Masque: nth-child (2) :: After {Top: 20; Left: 20; Height: 20; Width: 20; } .Masque: nth-child (3) :: After {Top: 40; Left: 40; Height: 20; Width: 20; } .Masque: nth-child (4) :: After {Top: 60; Left: 60; Height: 20; Width: 20; } .Masque: nth-child (5) :: After {Top: 80; Left: 80; Height: 20; Width: 20; } .Masque: nth-child (6) :: After {Top: 20; Left: 0; Height: 20; Width: 20; }   
 and the code continues till 25. The idea is that the grid was displayed (5 x 5 divis), 25 five squares  
  for full in the mask position (0..24) .mask: nth-child ({ I}): For J. (0..4) Top 20 * j 20 * j height 20 * j width 20 * j   
 How can I get it? If the above code is a way to get you, then there is a way to get it:  
 
 
 / P> 
 . Mascase status: i for absolute, j (1 .25) & amp;: nth-child ({i}): on top: 20 * h left: 20 * J Height : 20 width: 20

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