code:
; running under KiXtart 4.12

;dim $bSilent
;$bSilent=1

if not isdeclared($bSilent)
dim $bSilent
$bSilent=1
? '$$bSilent = '+$bSilent
endif
? '$$bSilent = '+$bSilent

When running this code the first line is printer correctly but the second line tells me tyhat $bSilent is empty. Uncommenting the top two lines will result in a correct output.
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There are two types of vessels, submarines and targets.