struct v2
    {
    double el[2];
    };

struct v4
    {
    struct v2 el[2];
    };

struct m22
    {
    double el[2][2];
    };

struct m24
    {
    struct m22 el[2];
    };

struct m42
    {
    struct m22 el[2];
    };

struct m44
    {
    struct m22 A;
    struct m22 B;
    struct m22 C;
    struct m22 D;
    };

struct triblock22
    {
    struct v2  *c;
    struct m22 *a;
    struct v2  *b;
    };

struct triblock24
    {
    struct m22 *c;
    struct m24 *a;
    struct m22 *b;
    };

struct triblock44
    {
    struct m42 *c;
    struct m44 *a;
    struct m42 *b;
    };

struct collmat
    {
    struct triblock22  *CF;
    struct triblock24  *C;
    struct triblock24  *CL;
    struct triblock22  *AF;
    struct triblock44  *A;
    struct triblock22  *AL;
    struct triblock24  *BF;
    struct triblock24  *B;
    struct triblock22  *BL;
    };

struct first_proc_collmat
    {
    struct triblock22  *CF;
    struct triblock24  *C;
    struct triblock22  *AF;
    struct triblock44  *A;
    struct triblock22  *AL;
    struct triblock24  *BF;
    struct triblock24  *B;
    };

struct last_proc_collmat
    {
    struct triblock24  *C;
    struct triblock24  *CL;
    struct triblock44  *A;
    struct triblock24  *B;
    struct triblock22  *BL;    
    };

struct proc_collmat
    {
    struct triblock24  *C;
    struct triblock44  *A;
    struct triblock24  *B;
    };

struct kvec2
    {
    struct v2 *el;
    };

struct kvec4
    {
    struct v4 *el;
    };

struct collvec
    {
    struct kvec2 *F;
    struct kvec4 *M;
    struct kvec2 *L;
    };

struct mat_collvec
    {
    struct collvec *el;
    };

struct mat_kvec4
    {
    struct kvec4 *el;
    };

struct gvec2  
    {
    struct v2 *el;
    };

struct gvec4
    {
    struct m42 *el;
    };