FourK by Depth [web]
.:._________________ _.:. ╖| _ 7 __7 _ 7 7 j 7╖ N ╖:|./ |._/_./_j_ _j. |:╖ .| | | | | || | |. ╖:l___l___l__j l_jl_l_j:╖cc ╖4k╖
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.:._________________ _.:. ╖| _ 7 __7 _ 7 7 j 7╖ N ╖:|./ |._/_./_j_ _j. |:╖ .| | | | | || | |. ╖:l___l___l__j l_jl_l_j:╖cc ╖4k╖