Cg: float3x3 and float[3][3]

Hi, I write shader in cg, i have to pass a uniform matrix parameter. There is no problem up to 4x4 size-matrices, as they are definied in cg as float 3x3, float4x4, etc., and i can use them perfectly. But float5x5 is NOT, and if i want to pass a float[5][5] matrix, it does not work. The values are not passed. It seems i cannot pass a float[5][5] matrix i have to convert it someway. If i pass tis way, it works: fragpout main(fragin IN, uniform float3x3 convMx) But this way it does not: fragpout main(fragin IN, uniform float convMx[3][3]) I understand they are not equivalent, but i have to use bigger matrices as well... Have you got any ideas?