SYNOPSIS
table.concat(table[,sep[,i[,j]]])
DESCRIPTION
Given an array where all elements are strings or numbers, returns
table[i]..sep..table[i+1] ··· sep..table[j]. The default value for sep is the empty
string, the default for i is 1, and the default for j is the length of the table. If
i is greater than j, returns the empty string.