replaceitem entity @s slot.hotbar 0 barrier
replaceitem entity @s slot.hotbar 1 concretepowder 1 0
replaceitem entity @s slot.hotbar 2 stone 1 0
replaceitem entity @s slot.hotbar 3 sand 1 0
replaceitem entity @s slot.hotbar 4 wool 1 0
replaceitem entity @s slot.hotbar 5 snow 1 0
replaceitem entity @s slot.hotbar 6 grass 1 0
replaceitem entity @s slot.hotbar 7 air 1 0
replaceitem entity @s slot.hotbar 8 air 1 0