In order to light a gas flame safely you need sufficient gas flow so it manages to catch fire quickly. If you do not have enough gas flow it is possible for the gas to be vented unevenly and take some time before it hits the spark igniter. By the time that sufficient amounts of gas have reached this igniter there may already be a big gas cloud above the stove that will explode all at once. Another danger is that on a low gas setting is possible that a cold stove may not be able to spread the flame to all gas ports at once. So you may end up with the stove half lit and gas venting out of the unlit sections with similar results as in the first scenario.
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