public static Command LMove(Delta sld1, Delta sld2)
{
Requires.Arg(sld1.IsSld(), nameof(sld1), "Argument is not a valid sld.");
Requires.Arg(sld2.IsSld(), nameof(sld2), "Argument is not a valid sld.");
return(new LMoveCommand(sld1, sld2));
}
