My hi beams stopped working but the low beams still work and its1bulb. I checked the relays and fuses and they are all good. What else could it be?

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First one went out and a few days later the other went out. It is the same bulb for hi and low so it should be working. I checked the relays and fuses under the hood and those are all good. What else can I check to get them working again?