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#' phonenumber: Convert letters to numbers and back as on a telephone keypad
#'
#' @section phonenumber functions:
#' \itemize{
#' \item \code{\link{letterToNumber}}: convert letters to numbers
#' \item \code{\link{numberToLetter}}: convert numbers to letters
#'}
#'
#' @docType package
#' @name phonenumber
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#> NULL
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