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# Filtrar las filas que tienen issn igual a cadena vacía o NAfilas_sin_issn<- filter(tabla_ordenada, issn==""| is.na(issn) |issn=="NA")
# Obtener el número de filas sin ISSNnum_filas_sin_issn<- nrow(filas_sin_issn)
# Mostrar el resultado
cat("Número de filas sin ISSN:", num_filas_sin_issn, "\n")