Problem: (6)descriptionsofthestartingandfinishinglines,classflagsandanyspecialsignalstobeused;
What's a sentence that uses these characters?
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(6) descriptions of the starting and finishing lines, class flags and any special signals to be used;

Problem: TheadvantageofadotcommandisthatyoucantypethesubjectandrecipientnamesinBraille.Soyoufirsttypeyourmailmessage,thenaddthedotcommand.
What's a sentence that uses these characters?
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The advantage of a dot command is that you can type the subject and recipient names in Braille. So you first type your mail message, then add the dot command.

Problem: Amanufacturerof3channelshigh-powerledwallwasherlww-5-24patGuangDongChina.
What's a sentence that uses these characters?
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A manufacturer of 3 channels high-power led wall washer lww-5-24p at GuangDong China.

Problem: Theycanflylongdistances,sinceamarkedspeciesdidflyasfaras1600km.
What's a sentence that uses these characters?
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They can fly long distances, since a marked species did fly as far as 1600 km.