The generator matrix

 1  0  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 2a+2 2a  2  1  1  1  1 2a  1  1  1  1  1  2  1  1  1  1  1  0  2 2a+2 2a  2  1  1  1 2a  1  1  1
 0  1  0 2a+2 2a  2  1 3a+2 3a+3 2a+3 2a+1 a+2  a a+1 a+3  3 3a 3a+1  1  1  1  0  1  a 3a+3  1 2a  2 a+3 2a+3 a+2  1 2a+2 2a+1  3 a+1 3a+1  1  1  1  1  1  a 3a a+2  1 3a+2 3a+2  a
 0  0  1  1  a 3a+3 3a+1 a+1 a+3 a+2 2a+1 3a+2 2a+2 2a+3 2a  2  3 3a 2a+1 3a a+1  2 3a+3  0 3a+1 3a+2 3a+2 a+3 2a+2  a a+2 a+3 2a+3  1 2a+2  3 3a+2 3a+1 3a+2 a+3 2a a+2 a+2 2a a+3  0 2a 3a+1  a

generates a code of length 49 over GR(16,4) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+444x^140+336x^141+204x^142+168x^143+570x^144+300x^145+360x^146+96x^147+207x^148+252x^149+96x^150+72x^151+192x^152+156x^153+24x^154+48x^155+282x^156+84x^157+84x^158+93x^160+24x^161+3x^164

The gray image is a code over GF(4) with n=196, k=6 and d=140.
This code was found by Heurico 1.16 in 0.422 seconds.