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/*!
# `IF expression THEN statements [ELSE statements]`
Also `IF expression GOTO line`.

## Purpose
Do something contingent on a predicate.

## Remarks
Statements may omit the word GOTO.

## Example
```text
10 A=10
20 IF A<30 THEN PRINT A:GOSUB 100:GOTO 20
90 END
100 A=A+10:RETURN
RUN
10
20
```

*/