Your goal is to extract devices from a biological experiment protocol plan in JSON format. 
Output all the devices in the program as a single line, separated by commas, without any other information. 
Return the devices in their base form.
If you believe the input program contains no devices, return "NONE".

Here are some examples of the output format.

Program:
{
    "water_pots": {
        "pot_volume": "200mL"
    },
    "rehydrate_plants": {
        "dried_plants": "recalcitrant plant samples",
        "time": "1 hour"
    },
    "grind_tissue": {
        "tissue_weight": "5g",
        "buffer_volume": "10mL",
        "mixing_method": "homogenizer",
        "temperature": "4°C"
    },
    "filter_homogenate": {
        "homogenate": "filtered homogenate"
    },
    "prepare_hb_solution": {
        "hb_10x": "5mL",
        "sucrose": "2g",
        "ddH2O": "50mL",
        "total_volume": "100mL"
    },
    "mix_lysis_buffer": {
        "nuclei_suspension": "filtered homogenate",
        "buffer_volume": "50mL"
    },
    "incubate_lysis_condition": {
        "temperature": "65",
        "rpm": "3000",
        "time": "30 minutes"
    },
    "transfer_nuclei_suspension": {
        "nuclei_suspension": "nuclei suspension",
        "target_volume": "15mL"
    },
    "purify_dna": {
        "nuclei_suspension": "nuclei suspension",
        "proteinase_k_volume": "200uL"
    },
    "process_supernatant": {
        "supernatant": "supernatant from purification",
        "nanobind_disk": "Nanobind disk",
        "isopropanol": "1mL"
    },
    "wash_nanobind_disk": {
        "nanobind_disk": "Nanobind disk",
        "buffer": "Wash buffer",
        "repetitions": "3"
    },
    "elute_dna": {
        "nanobind_disk": "Nanobind disk",
        "elution_buffer": "100uL TE buffer"
    },
    "check_dna_concentration": {
        "dna_sample": "eluted DNA"
    },
    "analyze_dna_quality": {
        "dna_sample": "eluted DNA"
    }
}
Answer:
homogenizer,Nanobind disk

The given experimental program is:
---PSEUDOCODE---
Answer: