[R] From SPSS Syntax to R code

[beky]

There is a code from SPSS Syntax

do if sub(ATVK,2,2)="01".
comp strata=1.
else if sub(ATVK,2,2)>="05" and sub(ATVK,2,2)<="27".
comp strata=3.
else if sub(ATVK,4,2)>"20" or sub(ATVK,6,2)>"20".
comp strata=4.
else if sub(ATVK,4,2)>"00".
comp strata=2.
end if.

value labels strata 1 "R 2 "Li" 3 "M" 4 "La".

How can i rewrite it in R code?
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