when its the

/summon falling_block ~ ~1 ~ {Block:iron_block,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:""},{id:commandblock_minecart,Command:"tellraw @a {\"text\":\"\\n [1.12] Space Laser\",\"bold\":\"true\",\"color\":\"gold\",\"extra\":[{\"text\":\" by IJAMinecraft\\n\",\"bold\":\"false\",\"color\":\"gold\"},{\"text\":\" http://youtube.com/c/IJAMinecraft)/%22,/%22bold/%22:/%22false/%22,/%22hoverEvent/%22:%7B/%22action/%22:/%22show_text/%22,/%22value/%22:%7B/%22text/%22:/%22Click here to visit my {链接已删除}channel!/",/"color/":/"white/"}},/"clickEvent/":{/"action/":/"open_url/",/"value/":/"https://www.youtube.com/user/IJAMinecraft/%22%7D,/%22color/%22:/%22white/%22,/%22italic/%22:/%22true/%22%7D,%7B/%22text/%22:/%22/n Read this:\",\"bold\":\"false\",\"color\":\"go

Never tell your password to anyone.

<3

Merry XMAS and Happy Holidays my son <3

ok i see how it is