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structures and forces (frame (Electric power transmission, net, Picture…
structures and forces
frame
Electric power transmission
net
Picture frames
shell
cup
Sydney Opera House
glass
manufactured
mass somethink completely soild
house
leaning tower of pisa
eiffel tower
mass somethink completely soild
rocks
Glaciers
ice
shell
egg shell
sea shell
snail shell
frame skeletal structure
skeleton
cob web
tree
natural