package main

import (
    "flag"
    "fmt"
    "math/rand"
    "time"
)

var (
    len_, count int
)

func init() {
    flag.IntVar(&len_, "l", 12, "len string")
    flag.IntVar(&count, "c", 15, "count strings")
    flag.Parse()
}

func main() {
    var total []string
    for i := 0; i < count; i++ {
        total = append(total, randString(len_))
    }
    for key, value := range total {
        if key > 0 && key%5 == 0 {
            fmt.Printf("\n")
        } else {
            fmt.Printf("%s\t", value)
        }
    }
    println()
}

func randString(c int) string {
    var r string
    rand.Seed(time.Now().UnixNano())
    var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_-+=;:'")

    func(n int) {
        b := make([]rune, n)
        for i := range b {
            b[i] = letterRunes[rand.Intn(len(letterRunes))]
        }
        r = string(b)
    }(c)
    return r
}