My first is in bread

My first is in bread but not in bead,

my second is in dig but not in dug,

my third is in fled but not in flew,
my fourth is in hid but not in hit,

my fifth is in held but not in herd,

my sixth is in step but not in stop.

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This is a perfect example of an easy kind of "my first" riddle because each line has just one possible solution. When I start writing these types of riddles, I will try these easy ones first to get used to the style!

Riddle.