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sets collections water drops drop hand hands recycle symbol save rain clouds plant plants growth tap taps leaf leaves shower dollar sign head cycle plumber plumbers repairman human person people occupation repair fix tank tanks trees tree cloud hose hoses bathtub bathtubs shield shields outline outlines linear linears line art minimalism minimal simple lines basic basics droplet droplets protected protect pure mineral minerals clean cleans stars star eco ecology conserve conservation bottle bottles storage storages dam dams raining raindrops