/summon FallingSand ~2 ~5 ~ {Passengers:[{id:FallingSand,Block:command_block,Time:1,Data:0,TileEntityData:{Command:setblock ~-1 ~-1 ~-15
chain_command_block 12 0 {auto:1b,Command:execute @a ~ ~ ~ scoreboard players set @e[score_breaker=1,score_breaker_min=1,r=2] drop 1}}}],Block:
command_block,Time:1,Data:0,TileEntityData:{Command:setblock ~ ~ ~-15 repeating_command_block 4 0 {auto:1b,Command:
execute @e[score_breaker=1,score_breaker_min=1] ~ ~ ~ testforblock ~ ~ ~ air}}}

cimaps commands in the database

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