if event.punch then
  local i = {
    "mesecons_materials:silicon",
    "default:iron_lump",
    "default:copper_lump",
    "technic:lead_lump"
  }
  local t = { type="set",
        offer={
            [1] = {give="currency:minegeld_5", give_count=1, pay=i[1], pay_count=25},
            [2] = {give="currency:minegeld_5", give_count=1, pay=i[2], pay_count=7},
            [3] = {give="currency:minegeld_5", give_count=1, pay=i[3], pay_count=6},
            [4] = {give="currency:minegeld_5", give_count=1, pay=i[4], pay_count=5},
        }
  }

  interrupt_pos(POS(-4,19,-99), {"mer_s9", t})
end

--[[

 mer_s1
 { type="set",
        offer={
            [1] = {give="currency:minegeld", give_count=1, pay="default:cobble", pay_count=99},
            [2] = {give="currency:minegeld", give_count=2, pay="default:mossycobble", pay_count=99},
            [3] = {give="currency:minegeld", give_count=4, pay="default:clay", pay_count=99},
            [4] = {give="currency:minegeld", give_count=1, pay="default:gravel", pay_count=99},
        }
  }


 mer_s2
 { type="set",
        offer={
            [1] = {give="currency:minegeld", give_count=1, pay="default:grass_1", pay_count=20},
            [2] = {give="currency:minegeld", give_count=1, pay="default:dry_grass_1", pay_count=20},
            [3] = {give="currency:minegeld", give_count=1, pay="default:junglegrass", pay_count=50},
            [4] = {give="currency:minegeld", give_count=1, pay="ethereal:dry_shrub", pay_count=50},
        }
  }
  mer_s3
    "ethereal:sponge_wet",
    "default:coral_skeleton",
    "ethereal:crystal_spike",
    "ethereal:fire_flower"

  mer_s4
    "default:papyrus",
    "ethereal:bamboo",
    "ethereal:bush",
    "ethereal:vine"

  mer_s5
    "default:leaves",
    "default:jungleleaves",
    "ethereal:bamboo_leaves",
    "ethereal:orange_leaves"

  mer_s6
    "mobs:blood",
    "mobs:honey",
    "mobs:hairball",
    "mobs:intestines"

  mer_s7
    "technic:plastic_clean",
    "technic:rubber",
    "technic:raw_latex",
    "technic:graphite"

  mer_s8
    "technic:aspirin_pill",
    "technic:silicon_wafer",
    "technic:doped_silicon_wafer",
    "technic:sulfur_lump"

  mer_s10
    "ethereal:blue_marble",
    "technic:marble",
    "technic:granite",
    "ethereal:etherium_dust"
]]--