its, two

shell, shells, sphere, ring, loop, rim, edge, zone, track, row, points, frame, block, parts, wall, cells, part, cell, house, point layer, layers, planets, orbit, planet, circle, reaches, edges, covering, limits, boundary, islands, boundaries, portion, membrane, limit, regions, heaven, surface, region, level covering, boundary, boundaries, element, energy electrons, electron, atomic

valence electrons, orbitals, band, shell, electron, shells, orbital, regionatomic orbitals, energy, orbital, electrons, layers, structure, valence, shells, layer, electron, shell, level, rows, sphere, surfacesorbital rim, electrons, margin, electron, margins, wall, walls, energy, region, satellite, portion, tissue, surface, ring, position, regions, circleboundary layer, layers, element, lines, line, contour, surfaces, zones, zone, edges, wall, walls, points, curve, row, surface, regions, regionthin layer, layers, coat, rim, shells, shell, membrane, walls, sheath, line, covering, skin, lines, rings, margins, section, margin, edge, fringe, cylinder, wall, fibers, frame, band, envelope, protective, branches, tail, edges, garment, boundary, ring, leaf, gate, surfaceleaf sheath, margins, surfaces, tissue, area, margin, surface, edges, tip, cells, fibers, coveringcontour lines, line, surfaces, curve, pointsplanets orbit, circlecell membrane, wall, lines, walls, surface, layers, surfaces, envelope, layer, line, periphery, tissue, block, function, boundariessatellite orbit, orbital, cells, cellclosed loop, loops, container, circles, contour, orbit, circle, shells, curve, shell, gateelectron orbitals, shells, pair, energy, orbital, orbit, shell, ringsoccupied orbitals, orbital, zone, valence, zones, areas, portionsprotective sheath, covering, layer, shell, layers, coat, envelope, garment, shells, walls, function, circle, wall, membrane, container, ring, zones, zone, skinfour corners, rows, walls, valence, parts, layers, zones, points, lines, rings, electrons, regions, orbitals, branchescylinder block, walls, wall, surfaces, filled, surface, whoseshell electrons, orbitals, electron, rings, membrane, element, structure, layers, covering, layer, filled, margin, atomicperimeter walls, wall, track, zones, zone, frame, blockcomponent partstissue sheath, layers, fibers, covering, envelope, cells, layer, contour, surfaces, component, marginsorbit satellitesheath cells, covering, cell, edge, regionend moraine, loop, zone, pointsfilled circles, valence, orbitals, loops, shells, container, circle, orbitalsurface layer, area, layers, contour, membrane, structure, energy, boundary, areas, coatborder regions, zone, region, zones, membrane, areas, area, line, lines, rowstop row, layer, edge, margin, edges, coat, corners, portion, layers, level, surface, rim, cornernext section, row, loop, four, loops, two, level, corner, blockfiber layer, membrane, tip, ring, surfaces, loop, rings, surface, layers, pairtail tip, fibers, coat, surfaces, sheath, end, fiber, gate, region, section, reaches, portionelectrons orbitmembrane covering, surfaces, surface, zone, structure, envelope, component, layersband edges, edge, valence, structure, electrons, shell, satellite, tailpair orbitals, electrons, orbitalcontainer filled, walls, wall, elementenvelope curve, membrane, function, filledgarment coveringfringe areas, element, zone, areaenergy electrons, electron, orbitals, band, level, surfaceswall covering, surfaces, layers, boundary, surfacetwo rows, parts, layers, points, electrons, branches, lines, loops, portions, regions, rings, planetszone boundary, boundaries, reaches, coveringskin covering, edges, surface, surfaces, layers, envelope, cells, coat, tissue, layer, marginsreaches itscircle circumference, whosearea occupied, coveringshells filledring circumference, structureblock island, walls, wall, boundarieslayer covering, structure, reachesrim band, region, edgeprimary function, electrons, electron, energy, structure, componentcurve reacheswhose circumference, primary, boundaries, branches, edges, wallsits tail, sheath, orbit, circumference, branches, scope, perimeter, periphery, boundariesgate closedcorners region, arealoop structure, container, regionstip reaches, topcoat tail, coveringposition occupiedframe structure, houseones whosecorner pointsfibers fiberareas occupiedregion occupiedstructure contourplanet whoselayers coveringedge contour, loopszones occupiedrow housesphere electron, whoseperiphery structureregions occupiedsection coveringcovering layer