• USD/JPY posts a modest gain Tuesday as Trsy yields, US shares climb

• A 1.3% rise in oil and surge in US nat gas also supports pair

• On pace to close near top of tight 156.90-157.41 daily range on EBS

• Momentum favors bulls though currently forming doji beneath 158

• Nov. services PPI in Japan, BOJ chief Ueda upcoming on Wednesday

• Move above 158 may be met with more offical warnings about yen weakness

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