Simple Fill clock

summon FallingSand ~ ~2 ~ {Time:1,Block:command_block,TileEntityData:{Command:fill ~ ~-1 ~ ~ ~-1 ~ redstone_block},Riding:{Time:1,Block:coal_block,id:FallingSand,Riding:{Time:1,Block:command_block,TileEntityData:{Command:fill ~ ~1 ~ ~ ~1 ~ wool},id:FallingSand}}}

/give @p written_book 1 0 {pages:["{\"text\":\"\",\"extra\":[{\"text\":\"Summon Fill Clock\",\"color\":\"green\",\"bold\":\"true\",\"clickEvent\":{\"action\":\"run_command\",\"value\":\"/summon FallingSand ~ ~2 ~ {         Time:1,Block:command_block,TileEntityData:{Command:fill ~ ~-1 ~ ~ ~-1 ~ redstone_block},Riding:{         Time:1,Block:wool,id:FallingSand,Riding:{Time:1,Block:command_block,TileEntityData:{Command:{fill ~ ~1 ~ ~ ~1 ~ wool},id:FallingSand }}}\"},\"hoverEvent\":{\"action\":\"show_text\",\"value\":{\"text\":\"\",\"extra\":[{\"text\":\"Summon a fill clock\"}]}}}]}"],title:Book,author:TellrawGenerator}