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var max = 12
var width = (max**2 -> len+1)
func fmt_row(*items) {
items.map {|s| "%*s" % (width, s) }.join
}
say fmt_row('x┃', (1..max)...)
say "#{'━' * (width - 1)}╋#{'━' * (max * width)}"
{ |i|
say fmt_row("#{i}┃", {|j| i <= j? i*j: ''}.map(1..max)...)