Since @samp{$} has no special meaning, you may use it in symbol names.
Registers can be given the symbolic names r0..r15, fp0, fp2, fp4, fp6.
-By using thesse symbolic names, @code{@value{AS}} can detect simple
+By using these symbolic names, @code{@value{AS}} can detect simple
syntax errors. The name rarg or r.arg is a synonym for r11, rtca or r.tca
for r12, sp, r.sp, dsa r.dsa for r13, lr or r.lr for r14, rbase or r.base
for r3 and rpgt or r.pgt for r4.