reti_read_LO: Making Land only data from reti csvfile
In rea-osaka/reti: Utility to handle real estate transaction price infomation data

This function Reads csvfiles for real estate transaction price data, which are provied by Ministry of Land, Infrastructure and Transport (MLIT), and makes land only data.

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reti_read_LO(path, timecount = FALSE, kind = "RCFU")

get_LOdata(path, timecount = FALSE, kind = "RCFU")

`path`	Vector of csvfile's path.
`timecount`	A logical scalar. you can see how much time did this function take to finish the work.
`kind`	String which contains Four character "R" or "C" or "F" or "U"; each character represents kind of land. There are four kind of land, residence, commrercial, factory and unresidence, which represent "R", "C", "F", "U", respectively.