12 16 15 33 8 20 200 0 1000 Excavation
SSSSSSSSSSSSSSdS
SbbbSbdbdbdSdbbS
SbSd bbdbSb bdbS
Sb dbbdSd dbSbbS
SdbdSdb bSdd ddS
Sddbddbdd bSdbbS
SSbbdSdbddb dddS
S dbb bbdSddSbSS
SbSdbdbdd bb b S
SdbdbbdbbSdbSdbS
SbbdpSdbd bb bbS
SSSSSSSSSSSSSSES
