Minecraft/src/main/java/com/microsoft/Malmo/MissionHandlers/AgentQuitFromCollectingItemQuantityImplementation.java [97:127]:
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        if (event.stack != null && event.cause == 0)
            checkForMatch(event.stack);
    }

    @SubscribeEvent
    public void onPickupItem(EntityItemPickupEvent event) {
        if (event.getItem() != null && event.getEntityPlayer() instanceof EntityPlayerMP)
            checkForMatch(event.getItem().getEntityItem());
    }

    @SubscribeEvent
    public void onItemCraft(PlayerEvent.ItemCraftedEvent event) {
        if (event.player instanceof EntityPlayerMP && !event.crafting.isEmpty())
            checkForMatch(event.crafting);
    }

    @SubscribeEvent
    public void onItemSmelt(PlayerEvent.ItemSmeltedEvent event) {
        if (event.player instanceof EntityPlayerMP && !event.smelting.isEmpty())
            checkForMatch(event.smelting);
    }

    /**
     * Checks whether the ItemStack matches a variant stored in the item list. If
     * so, returns true, else returns false.
     *
     * @param is The item stack
     * @return If the stack is allowed in the item matchers and has color or
     * variants enabled, returns true, else false.
     */
    private boolean getVariant(ItemStack is) {
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Minecraft/src/main/java/com/microsoft/Malmo/MissionHandlers/RewardForCollectingItemQuantityImplementation.java [51:81]:
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        if (event.stack != null && event.cause == 0)
            checkForMatch(event.stack);
    }

    @SubscribeEvent
    public void onPickupItem(EntityItemPickupEvent event) {
        if (event.getItem() != null && event.getEntityPlayer() instanceof EntityPlayerMP)
            checkForMatch(event.getItem().getEntityItem());
    }

    @SubscribeEvent
    public void onItemCraft(PlayerEvent.ItemCraftedEvent event) {
        if (event.player instanceof EntityPlayerMP && !event.crafting.isEmpty())
            checkForMatch(event.crafting);
    }

    @SubscribeEvent
    public void onItemSmelt(PlayerEvent.ItemSmeltedEvent event) {
        if (event.player instanceof EntityPlayerMP && !event.smelting.isEmpty())
            checkForMatch(event.smelting);
    }

    /**
     * Checks whether the ItemStack matches a variant stored in the item list. If
     * so, returns true, else returns false.
     *
     * @param is The item stack
     * @return If the stack is allowed in the item matchers and has color or
     * variants enabled, returns true, else false.
     */
    private boolean getVariant(ItemStack is) {
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