I know I will kick myself when I see the answer but I cannot see what is 
wrong with this syntax:

_S1 is okay
_S2 and _S3 won't parse.

What on earth am I missing?

#version unofficial MegaPov 1.10;

#local _S1 =
spline {
         extended_x_spline freedom_degree 1.0
         0/3, <-2,  .500,   0>
         1/3, <-1,  .666,   0>
         2/3, <1,   .166,   0>
         3/3, <2,   .500,   0>
};


#local _S2 =
spline {
         extended_x_spline
         0/3, <-2,  .500,   0>  freedom_degree 1.0,
         1/3, <-1,  .666,   0>  freedom_degree 1.0,
         2/3, <1,   .166,   0>  freedom_degree 0.1,
         3/3, <2,   .500,   0>  freedom_degree 1.0
};


#local _S3 =
spline {
         extended_x_spline  freedom_degree 1.0
         0/3, <-2,  .500,   0>  freedom_degree 1.0,
         1/3, <-1,  .666,   0>  freedom_degree 1.0,
         2/3, <1,   .166,   0>  freedom_degree 0.1,
         3/3, <2,   .500,   0>  freedom_degree 1.0
};


//spline {
//  extended_x_spline [freedom_degree FLOAT]
//  time_Val_1, <Vector_1> [freedom_degree FLOAT ][,]
//  time_Val_2, <Vector_2> [freedom_degree FLOAT ][,]
//  ...
//  time_Val_n, <Vector_n> [freedom_degree FLOAT ]
//}

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