# NOT RUN {
validNlPeriodOLS("2015")
# }
# NOT RUN {
#returns FALSE
# }
# NOT RUN {
validNlPeriodOLS("2004")
# }
# NOT RUN {
#returns TRUE
# }
# NOT RUN {
validNlPeriodOLS("201201")
# }
# NOT RUN {
#returns FALSE
# }
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