return {
    'item/iron-axe',
    'item/burner-mining-drill',
    'item/burner-inserter',
    'item/stone-furnace',
    'item/light-armor',
    'item/steam-engine',
    'item/inserter',
    'item/transport-belt',
    'item/underground-belt',
    'item/splitter',
    'item/assembling-machine-1',
    'item/long-handed-inserter',
    'item/electronic-circuit',
    'item/electric-mining-drill',
    'item/heavy-armor',
    'item/steel-furnace',
    'item/steel-axe',
    'item/gun-turret',
    'item/fast-transport-belt',
    'item/fast-underground-belt',
    'item/fast-splitter',
    'item/assembling-machine-2',
    'item/fast-inserter',
    'item/radar',
    'item/filter-inserter',
    'item/defender-capsule',
    'item/pumpjack',
    'item/chemical-plant',
    'item/solar-panel',
    'item/advanced-circuit',
    'item/modular-armor',
    'item/accumulator',
    'item/construction-robot',
    'item/distractor-capsule',
    'item/stack-inserter',
    'item/electric-furnace',
    'item/express-transport-belt',
    'item/express-underground-belt',
    'item/express-splitter',
    'item/assembling-machine-3',
    'item/processing-unit',
    'item/power-armor',
    'item/logistic-robot',
    'item/laser-turret',
    'item/stack-filter-inserter',
    'item/destroyer-capsule',
    'item/power-armor-mk2',
    'item/flamethrower-turret',
    'item/beacon',
    'item/steam-turbine',
    'item/centrifuge',
    'item/nuclear-reactor'
}
