A measure of the enduring difficulty of Dawes's routes is how few of his hardest climbs have been attempted "on sight" – the purest style of making a climb, done without pre-practice, pre-inspection of the route or prior knowledge of the moves or possibilities for protection.
But if nothing else, the fight between the governor and what seems like every principal, teacher and parent-teacher group in the state shows the enduring difficulty of finding an evaluation system that works.
Unsurprisingly, the film had a troubled route to the screen, reflecting both the enduring difficulty of telling black stories in Hollywood, and the inherent complexity of dramatising the life of such a divisive figure.
"In the District of Massachusetts," he wrote, "the government has had enduring difficulty in discharging its duty to disclose material exculpatory information to defendants in a timely manner".
And it was from near modern-day Kadesh Barnea, a small village by Israel's southern border with Egypt, that on Monday another event proved the enduring difficulty of ruling this land.
To be sure, Mr. Reagan's failure to curb the cost of government reflected the enduring difficulty all presidents face in balancing the government services Americans want with the taxes they're willing to pay.
The more enduring difficulty of interpreting Pindar derives from the fact that his poetry was composed for special occasions and is rich with references to persons, places, mythical figures, and historical events that were known to the original audience but are obscure for modern readers.
But even a cursory glance through the CVs of remaining IOC members demonstrates the enduring difficulties of a fresh start.
That analogy is a measure of the profound and enduring difficulties in the war in Afghanistan, which this year became more deadly for Americans than the Iraq conflict.
In a sub-group of women with enduring difficulties, including poverty and abusive relationships, the perinatal period may be additionally burdensome and lead to persistent mental ill health.
The vocabulary lists for Arabic lessons reflected both the country's shifting politics and its enduring difficulties.
