Question: minimum indices in matrix

hey i´m back again and need help to solve this situation Please:                                          restart;with(ArrayTools):                                                                                                                                               


a:=map(ceil,8*RandomArray(2,4):#at this point, i need to find the minimum by colunm and for that a do that



if it is possible i wont to have c or other leter wich result is numbers present in a. Please note, that i work with indicies



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