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Copyright Images

The following images are purchased from iStockphoto and are licensed for use:

"Smiling girl with laptop, thumbs up” © GoodMood Photo
"endless love” © poco_bw
"trust highligted in dictionary” © Stephan Zabel
"Elderly african woman” © poco_bw
"Couple in the park" © Nikolay Mamluke
"value highligted in dictionary" © Stephan Zabel
"blooming cherry trees" © Volker Rauch
"Tree Huggers" © RonTech2000
"Senior Woman Still A Flirt" © Sean_Warren
"daddy's hand" © Mary Gascho
"Flags" © Maxym Boner
"Morning Windmill" © MudGuy
"Ahu Tongariki on Easter Island" © Andrzej Gibasiewicz
"Saint Basil's Cathedral and The Kremlin in Moscow" © Dmitry Mordvintsev
"Australia's Great Barrier Reef (High Resolution aerial shot)" © KJA
"Little exploring" © Danijela Pavlovic Markovic
"Stormy Wheatfield" © Sam Burt Photography
"Pain and Sadness" © M. Eric Honeycutt
"Senior with back pain" © Pamela Moore
"Senior Man's Hand Holding Glass" © JJRD
"Depression" © Sergey Ozerov
"young man thinking" © zhang bo
"Bad situation" © Factoria Singular
"Couple Walking Through Tall Grass Field at Sunset" © Aldo Murillo
"partnership highlighted in dictionary" © Stephan Zabel
"Three coworkers at a team meeting" © nicole waring
"Pretty woman in golden wheat field with flying red scarf" © selimaksan
"Genius Road Sign" © Geoffrey Holman
"Business team" © Dimitrije Paunovic (2)
"Five college students" © ericsphotography
"Cheerful Senior Indian Mathematics Teacher in a Classroom" © VikramRaghuvanshi
"Young girl is discovering the surrouding" © Bart Coenders
"competence highlighted in dictionary" © Stephan Zabel
"message in a bottle" © archives
"Summer beautiful portrait in soft sunlight" © Igor Balasanov

The following images are purchased from gettyImages and are licensed for use:

"Brussels, Belgium" © Ghislain & Marie David de Lossy (3)
"Scientists looking at DNA model" © Adam Gault
"Ambach, Germany” © Henglein and Steets (3)
"Pokhara, Nepal" © Travel Ink
"Teacher and pupils in classroom at elementary school, Lhasa, Tibet" © Danita Delimont
"outdoors, studio, wood background" © Steve Wisbauer
"Stressed businessman" © Comstock Images
"Young couple, portrait" © Philippe McClelland
"Couple relaxing" © Image Source
"Mature woman with head in hands and eyes closed, close-up" © Christopher Robbins
"Brooklyn, New York, USA" © Andrew Hetherington (3)
"Penzance, Cornwall, UK" © Ashley Jouhar
"Ho Chi Minh City, Vietnam." © Philippe McClelland
"Loving couple" © Image Source

All other images © Grünenthal.