col-first / col-last question

[olien]

hi,

how can i do that:

XS = | A = 12 |
     | B = 12 |
     | C = 12 |

MD = | A = 6 | B = 6 |
     | C = 6 |  (B)  |

LG = | A = 3 |  B = 6  | C = 3 |

BR Oliver