{49, "SIGCAPI", "signal 49"},
	{58, "SIGRECONFIG", "signal 58"},
	{59, "SIGCPUFAIL", "CPU Failure Predicted"},
	{60, "SIGKAP", "monitor mode granted"},
	{61, "SIGRETRACT", "monitor mode retracted"},
	{62, "SIGSOUND", "sound completed"},
	{63, "SIGSAK", "secure attention"},

	{49, "SIGCAPI", "signal 49"},
	{58, "SIGRECONFIG", "signal 58"},
	{59, "SIGCPUFAIL", "CPU Failure Predicted"},
	{60, "SIGGRANT", "monitor mode granted"},
	{61, "SIGRETRACT", "monitor mode retracted"},
	{62, "SIGSOUND", "sound completed"},
	{63, "SIGMAX32", "secure attention"},
	{255, "SIGMAX", "signal 255"},

//
// require directives are not de-duplicated. That's left up to higher-level
// logic (MVS).
//
// retract directives are not de-duplicated since comments are
// meaningful, and versions may be retracted multiple times.
func (f *File) removeDups() {
	removeDups(f.Syntax, &f.Exclude, &f.Replace)
}

func removeDups(syntax *FileSyntax, exclude *[]*Exclude, replace *[]*Replace) {
	kill := make(map[*Line]bool)

	for i := range retractions {
		i := i
		r.work.Add(func() {
			err := modload.CheckRetractions(ctx, retractions[i].m)
			if retractErr := (*modload.ModuleRetractedError)(nil); errors.As(err, &retractErr) {
				retractions[i].message = err.Error()
			}
		})
	}

	// Load deprecations for modules mentioned on the command line. Only load

Sun's Light let into a dark Room through a hole F one third part of an Inch broad, M its Incidence on the Base of the Prism, MG a less refracted Ray, MH a more refracted Ray, MN the beam of Light reflected from the Base, VXY the second Prism by which this beam in passing through it is refracted, N_t_ the less refracted Light of this beam, and N_p_ the more refracted part thereof. When the first Prism ABC is turned about its Axis according to the order of the Letters ABC, the Rays MH emerge more and...

Room through a hole F one third part of an Inch broad, M its Incidence
on the Base of the Prism, MG a less refracted Ray, MH a more refracted
Ray, MN the beam of Light reflected from the Base, VXY the second Prism
by which this beam in passing through it is refracted, N_t_ the less
refracted Light of this beam, and N_p_ the more refracted part thereof.
When the first Prism ABC is turned about its Axis according to the order