#!/bin/ruby

def build_array(size, swaps)
    return -1 if swaps < 0 || size < 1
    if swaps == 0
        return [1] if size == 1
        return -1 
    end
    #p "#{size} #{swaps}"
    array = build_array(size-1, swaps-(size-1))
    #p "#{size} #{swaps}: Received #{array} from #{size-1}, #{swaps-(size-1)} Front"
    if array != -1
        return array.unshift(size)
    else
        array = build_array(size-1, swaps-((size-1)/2))
        #p "#{size} #{swaps}: Received #{array} from #{size-1}, #{swaps-((size-1)/2)} Front"
        if array != -1
            return array.push(size)
        else
            return -1
        end
    end
end

q = gets.strip.to_i
for a0 in (0..q-1)
    len,c = gets.strip.split(' ').map(&:to_i)
    if (array = build_array len, c) == -1
        p -1
    else
        puts array.join ' '
    end
end